It's a brave new world so only time will tell.

How many of the teams involved in the Club World Cup will feel they need to add to their ranks? Will the other 18 Premier League clubs be tempted to get involved?

Some teams have already taken advantage of the early window, with Real Madrid signing Trent Alexander-Arnold from Liverpool.

Meanwhile, the Reds have already wrapped up a deal for right-back Jeremie Frimpong from Bayer Leverkusen.

And Manchester United are started their rebuild with Wolves forward Matheus Cunha heading to Old Trafford.

Image source, Getty Images

Firstly, to bring order to the global registration system, world governing body Fifa only permits the transfer window in any individual country to be open for 16 weeks in any calendar year.

In Europe, precedent dictates four of those weeks are for the winter window, leaving 12 in the summer. In 2024, the Premier League transfer window opened on 14 June and closed on 30 August.

However, in October, Fifa approved an additional window from 1-10 June that would allow the 32 clubs competing in the Club World Cup to register new players before the tournament.

It also agreed to open a registration window mid-tournament, from 27 June and 3 July, to allow clubs to register additional players for the knockout stage.

As well as Manchester City and Chelsea, European heavyweights Real Madrid, Atletico Madrid, Inter Milan, Juventus, Paris St-Germain, Bayern Munich, Borussia Dortmund and Saudi Arabia's Al-Hilal are among others playing in the tournament.

In order to ensure Manchester City and Chelsea did not have an advantage over the other 18 top-flight clubs, the Premier League has adopted the same window.

However, 12 weeks from 1 June is 24 August. The Premier League wanted to be aligned with the rest of Europe's big leagues around when the summer window closes. Those leagues preferred to close the window at the end of August, so that meant the window had to close and reopen.

Your questions are already coming in thick and fast - it's much appreciated because I don't fancy filling for large periods of the day.

While our football reporters are busy tapping away with their responses, let's get the housekeeping out of the way in regard to explaining why this early transfer window is happening and what problems it potentially poses.

And so it begins...

Players popping up in random places is a major part of the transfer window, right?

Where is the strangest place you've seen an incoming player? Erling Haaland in Greggs? Emi Martinez at Halfords?

Can you hear that?

It's the sound of fax machines all over the country warming up as clubs prepare to do some unusually early summer business.

The summer transfer window opened on Sunday and is set to close on 10 June at 19:00 BST.

Why?

Well, that's because the window has been split into two parts to accommodate for teams playing in the Club World Cup.

The window will reopen on Monday, 16 June, before closing on Monday, 1 September at 19:00 BST for Premier League, EFL and Scottish Premiership clubs.

BBC Sport football reporters Simon Stone, Sami Mokbel and Nick Mashiter are on hand to answer you transfer window questions today.

I promised earlier that I'd provide you with the details on how to get in touch and I'm not one to let you down.

I'm sure most of you have already got these details - the phone number is on speed dial, right?

If not, then you can send your message using #bbcfootball on X, via WhatsApp on 03301231826 or text 81111 (UK only, standard message rates apply).

Image source, Getty Images

I know we're all excited about the transfer window and eager to see how much money our respective clubs are set to throw around... but I'm going to have to plant your feet firmly back on the ground momentarily with four words that have seeped into the footballing vocabulary over the past year or so.

Profit and sustainability rules (PSR).

The Premier League's PSR rules have hindered clubs from spending big money in recent transfer windows.

Everton and Nottingham Forest received points deductions last season for breaking the league's spending rules.

Though no clubs have fallen foul of the rules this year, it will be something the clubs will be considering as they look to bolster their roster.

So what exactly is PSR?

Premier League introduced the profit and sustainability rules during the 2015-16 season.

It came from demands to protect clubs from overspending after Portsmouth became the first - and so far only - Premier League club to go into administration.

The rules allow Premier League clubs to post losses of no more than £105m over a three-year reporting cycle.

Spending on academies, infrastructure and community projects are exempt from profit and sustainability submissions.

• Have you heard a rumour about a player and want some more information?
• Do you need some clarity as to whether a transfer target will fit into your team's current system?
• Is your manager under pressure and you want to know who is in line to replace them?
• Do you want to find out if your club's transfer kitty has enough in it to attract players?

We've got Simon Stone, Alex Howell, Sami Mokbel and Nick Mashiter on call to answer those questions for you.

How are we all doing today? Good weekend?

With domestic football now done* for 2024-25 it's time to start shifting our focus to the transfer window and that's exactly our plan today as we offer you the opportunity to send in questions for our football reporters.

We'll get the details to you shortly on how you can get those questions across.

Before we dive straight in, we'll also give you a bit of background as to why the transfer window is open, who has already done business and what other players could be on the move.

*Of course, there is still the Club World Cup to come in 12 days.