Were you at the game or following from elsewhere?
What did you make of the display, Arsenal fans?, external
Seagulls fans, have your say on Brighton's performance, external
Come back to this page on Sunday evening to find a selection of your replies
There are seven Premier League games this Saturday and BBC Sport will bring you all the action and reaction throughout the day.
All times BST
Follow all the action and reaction here
BBC Radio 5 Live match commentaries:
Raheem Sterling's switch to Arsenal will "delight" the club's players, says former Premier League midfielder Michael Brown.
Brown feels Sterling is "a sensational signing" for the Gunners.
BBC Radio 5 Live discuss Raheem Sterling potential signing to Arsenal
Alex Howell
BBC Sport football news reporter
Image source, Getty ImagesArsenal picked up one of the deals of the transfer window by signing Chelsea forward Raheem Sterling on loan for the season.
The deal which will see Arsenal pay around 50% of Sterling's wages.
The Gunners had been hoping to use Mikel Merino in his first match since he signed from Real Sociedad but he picked up an injury in training.
The focus will be on making sure that Arsenal pick up a win against a Brighton side who have started the season in excellent form with wins over Everton and Manchester United.
Mikel Arteta and Arsenal have been focusing on controlling games as they look to build momentum for when the matches later in the season carry even more importance.
You've made your selection below on how you feel about Sterling - now's your chance to explain in a bit more detail.
Tell us what you make of his signing and how Mikel Arteta can get the best out of him in an Arsenal shirt.
Head here to post your views, external - we'll post a selection on Monday
Phil McNulty
Chief football writer
Image source, Getty ImagesAfter Arsenal's late intervention on deadline day, Raheem Sterling has been presented with the ideal outcome and opportunity to rescue his career from cold storage.
He is able to stay in his native London and joins a club hoping to bridge the gap to Manchester City and become Premier League champions this season, with the added attraction of Champions League football.
New boss Mikel Arteta has never hidden his admiration for Sterling, saying recently: "We built a really strong relationship together at Manchester City. He was unbelievable at that time. He is someone I have really strong feelings about."
It is a chance Sterling must have thought was a distant prospect when deadline day began, with reported interest from Manchester United and Paris St-Germain failing to materialise and options limited.
While it is true Sterling has not made the impact expected at Chelsea, he can hardly be branded a failure with his 19 goals in 81 appearances, including 10 in 43 games last season as they finished sixth and returned to Europe under Mauricio Pochettino.
Arteta has been in the hunt for added goal threat, and while Sterling cannot be regarded as a consistent marksman - though his career record is a respectable 173 goals in 549 games - Arsenal will be getting a player who will be highly motivated given the circumstances of his very public rejection by Enzo Maresca and Chelsea.
If Arteta can reignite the fire inside Sterling once more and bring him back towards his best, this shock transfer may yet be a masterstroke.
How do you feel about Sterling? Make your selection here
Chris Sutton is making predictions for all 380 Premier League matches this season, against a variety of guests.
For week three, he takes on MOBO Award-winning drum & bass legend and producer Adam F.
Sutton's prediction: 2-0
Arsenal, their win at Villa last week was a bit of a statement because last season Aston Villa did the double over them.
Two teams with a 100% record. Brighton have got off to a flyer under Fabian Hurzeler and they are very expensive in the way they play, they are brave, they back themselves.
But it's Arsenal, at home, at the Emirates, I think they will win this one.
Adam F's prediction: 2-1
Arsenal should take this one.
Image source, Getty ImagesRaheem Sterling says Arsenal provides "the perfect fit" for him after completing his loan move from Chelsea.
Sterling, 29, has made 81 appearances for Chelsea but was not part of their first-team plans this season.
On switching to the Gunners he said: "It’s an unbelievable feeling. It’s really exciting. I’m buzzing.
"Looking at everything, I’m just, like, ‘This is a perfect fit for me’, and I’m super happy that we got it over the line."
"I spoke with Edu and I said that it’s something you can see from the outside, you can see the real togetherness from Mikel’s time here and you see the journey that the boys are on, and you can see the hunger, and I keep saying again, the togetherness is something I’m looking to be a part of."
Image source, Getty ImagesGoalkeeper Neto says he feels "really lucky" to join Arsenal after signing a season-long loan deal from Bournemouth.
Following the departure of Aaron Ramsdale to Southampton, Neto, 35, will provide experienced back-up to regular number one David Raya.
The Brazil international said: "I'm realising a dream in my life, a dream come true, and I'm really, really happy.
"I had two dreams as a kid to play for a football team. It was my team in Brazil, where I grew up and became a professional footballer, and also Arsenal. And now I'm realising it! I'm a really lucky person.
"To all the supporters of Arsenal, I'd just like to say I'm one more fan here. My dream has come true, I'm really happy. Depend on me, I'll give more than 100% to give everything for Arsenal."
Nizaar Kinsella, Alex Howell and Simon Stone
BBC Sport football news reporter
Image source, Getty ImagesArsenal are in talks to sign Chelsea winger Raheem Sterling.
The 29-year-old is believed to be keen on a move across London which could take the form of a loan deal.
The main complication involved in the talks is in how to cover the England international's £300,000-a-week wages.
Former Arsenal and Chelsea midfielder and Planet Premier League pundit Cesc Fabregas believes the transfer window should close before the season begins.
Nat Hayward
BBC Sport journalist
Arsenal boss Mikel Arteta has been speaking to the media before Saturday's Premier League game against Brighton (kick-off 12:30 BST).
Here are the key lines from his news conference:
New signing Mikel Merino will be out "for a few weeks" with a shoulder injury suffered in training: "Very unfortunate. Yesterday he had a collision and he has a shoulder injury. He landed on the floor and Gabi [Gabriel] landed on top of him and it looks like he has a small fracture probably."
Gabriel Jesus will miss Saturday's match but is "progressing really well" in his recovery from a groin injury. Takehiro Tomiyasu is also unavailable with a longer-term knee problem.
Arteta refused to be drawn into talking on reported target Raheem Sterling, saying: "You know that I cannot talk about another player." He also refrained from commenting on Eddie Nketiah, who is reportedly close to a move to Crystal Palace: "When that happens, we can talk about that."
On potential deadline day activity: "There are still a few hours to go. We are prepared. Let's see, it's always possible. In the last 24 hours of the transfer window never rule out anything."
Arteta paid tribute to outgoing goalkeeper Aaron Ramsdale: "Thank you so much for what he’s done for the club, for the team and for myself. He brought a lot of joy and charisma and was really good when he joined."
On Bournemouth goalkeeper Neto, who is set to replace Ramsdale: "It’s clear that we have lost Karl [Hein] and Aaron so we have to replace them both."
We asked what you have made of Arsenal's transfer window so far, and what needs to be done on deadline day.
Here are some of your comments:
Richard: Club is cluttered with midfielders and defenders but no quality striker - Trossard, Martinelli are not, Jesus is injured once again, Havertz goes missing in games. To win the Premier League we need a striker!
Vincent: We need a replacement for Ramsdale and a commanding centre-forward to get on the end of that last ball. Surely we're now in a position to attract a Toney or Gyokeres...
Marvin: I only pray for Nico Williams to come into the team for his skills, speed and goalscoring.
James: Good transfer window so far. I have confidence in what the club are doing. Shame to see up to four good English players leave, but the goal is to keep improving as a club, and those players can really progress with more time on the pitch. Need a replacement keeper and striker, hope that there is time to complete both to keep us moving forward.
Labeeb: We should get Kingsley Coman because he is quality and since we have been linked to Ivan Toney, we should get him before deadline day because Jesus isn't that good any more.
Simon Stone
Chief football news reporter
Image source, Getty ImagesBournemouth goalkeeper Neto is having a medical with Arsenal on Friday morning before a loan move.
Kepa Arrizabalaga's arrival at the Cherries from Chelsea meant the Cherries were open to doing a deal and that was agreed on Thursday night.
With Aaron Ramsdale on his way to Southampton, Neto will presumably be back-up to Gunners number one David Raya.
Here's all you need to know about transfer deadline day on Friday...
When does the window close?
The transfer window will close at 23:00 BST on Friday, 30 August for the Premier League, English Football League and Scotland.
The date was brought forward by the domestic leagues to align with European leagues.
Across Europe, the Bundesliga window will close at 19:00, Ligue 1 at 22:00, La Liga at 22:59 and Serie A at 23:00, but the Saudi Pro League transfer window remains open until 7 September.
Can a Premier League player signed on deadline day play this weekend?
Under league rules, new signings are eligible for the next Premier League game if the club submit the required documents by midday on the last working day before that match.
So any player signed after 12:00 on deadline day would be unable to play in this round of Premier League fixtures.
Where can I see all the confirmed transfer deals on deadline day?
You can find all the deals completed on transfer deadline day within our dedicated confirmed transfers page.
When does the January transfer window open?
Clubs will be able to make transfers again from Wednesday, 1 January until Monday, 3 February at 23:00 GMT. This is the same in Germany, Italy, Spain and France.
How can I follow transfer deadline day on the BBC?
We have this live page dedicated to all the latest transfer news, reaction and analysis.
You will also find regular updates on BBC Radio 5 Live and breaking news across BBC Sport's social media channels, including X (formerly Twitter), Facebook, Instagram and TikTok.
There will also be a special edition of The Football News Show on BBC iPlayer and the Red Button from 22:00 until 23:15.
Arsenal are weighing up moves for Chelsea's 29-year-old England forward Raheem Sterling or Bayern Munich's France winger Kingsley Coman, 28, having been approached about both in the final two days of the transfer window. (Independent), external
Want more transfer stories? Read Friday's full gossip column
