The BBC has extensive live coverage of the 2015 World Championships across TV, Red Button, radio, desktop, mobile, tablet and app.  

And the coverage starts on Friday with a special preview on BBC Two from 19:00 BST.

On the eve of the 15th World Athletics Championships, from the iconic Bird's Nest Stadium in Beijing - the centrepiece of the city's 2008 Olympic Games, Gabby Logan and guests discuss the big stories heading into nine days of competition.

Full coverage list here.

Image source, Getty Images

Jose Mourinho on the prospect of signing Everton defender John Stones:

"I don't speak about players from other clubs.The opportunity window, in these last two weeks, it depends on the opportunities. 

"Can you do something you believe you can't lose the opportunity to do."

Jose Mourinho on the signing of Pedro: "I only want to beat Manchester United on the pitch, our job is to get the best players... Everything started with the fact we understood the player was ready to leave the club of his dreams."

Image source, Getty Images

Image source, Getty Images

Chelsea boss Jose Mourinho: "We train better than ever because we are not happy with the results. New players are always welcome so I am happy both come to us.

"I know the Premier League doesn't start tomorrow, it started two weeks ago. People used to call it the transfer window, I call it the opportunity window. It is dangerous because every team can lose players in a minute.

"But at the same time it is an opportunity window to get players in at the last moment."

Will Pedro make his Chelsea debut in the Black Country?

This should be entertaining...

More on the news that Surrey fast bowler Chris Tremlett has announced his retirement at the age of 33.

He took 17 wickets in three Tests to help England to a 3-1 win in the 2010-11 Ashes series in Australia.

"Wearing the Three Lions was the pinnacle and I enjoyed every minute of the challenge, experience, and ultimately the success that the team had," he posted on twitter., external

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Tottenham Hotspur  hope Pedro’s arrival at Chelsea will encourage their rivals to do business with them over Victor Moses, according to Friday's London Evening Standard., external

Spurs want to sign a winger before the transfer window closes and Moses, 24, is one of the players they want.

Some great shouts coming in for Your Best Goal. Keep them coming at #bbcsportsday, external or post on the Match of the Day Facebook, external page.

Ian Cookson: Got to be Shearer's sumptuous volley for Newcastle against Everton (2002). Perfect technique from that range.  

Andy Bee: Zidane. Volley. Sends Hampden into raptures. 

Rich Cawser: Matt Le Tissier's goal v Blackburn in 1994 was the ultimate screamer. Looks like Flowers is floating as the ball goes in!   

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Former England bowler Chris Tremlett, 33, announces his retirement from the game.

"After 16 enjoyable years in a game that has given me so much I feel that now is the right moment to call time on my playing career," the Surrey player tweeted., external

West Ham United entertain Bournemouth on Saturday but Argentine forward Mauro Zarate will not be involved...

Sunderland face competition from Marseille to buy former Swansea City loan signing  Jonathan De Guzman, reports Friday's Sunderland Echo., external

The 27-year-old midfielder is currently at Napoli.

Former Liverpool defender and Brighton managerSami Hyypiais back in management...in Switzerland with FC Zurich.

Aston Villa manager Tim Sherwood says he has a 'love-hate' relationship with teenage midfielder Jack Grealish.

The 19-year-old has been warned about his off-field behaviour, and Sherwood tells the Birmingham Mail:, external "He’s a superb talent for this football club and young kids make mistakes.

“Hopefully he’s over that and he can learn from it.I love him and hate him at the same time."

Image source, Getty Images

Image source, Getty Images

Hull Citymay miss out on Brentford striker Andre Gray, but one forward who looks like he is on the way to the KC Stadium isShaun Maloney.

The Championship side haveagreed an undisclosed feewith MLS side Chicago Fire for the 32-year-old Scotland international.

"We hope we can get it tied up by the weekend. We look close," Hull boss Steve Bruce told BBC Radio Humberside.  

Newcatle United's hopes of signing 26-year-old Monaco defender  Aymen Abdennou could hinge on selling 31-year-old Mike Wiliamson, reports Friday's Newcastle Chronicle., external

Here's some inspirationif you are thinking about getting involved with our Everyday Athletics topic today. 

BBC Get Inspired have put together some videos to show how you can get more active in your day-to-day lives without the need for running spikes and a technical T-shirt. You'll have to add your own Steve Cram commentary though.

Tweet #everydayathletics

Canaries boss Alex Neil is in confident mood for Saturday's tie at home to Stoke. 

Following last weekend's 1-3 win away to Sunderland, he said: "I think the players will take a lot of confidence from the manner with which we played, and the fact that we won the game so convincingly. 

“We want to make sure that our home form is good, and hopefully we can start that on Saturday.” 

On Stoke: “We’ve got to force our style of play on them and make sure that we work as hard as they do, or even harder to make sure we can go and get the result.” 

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Tim Sherwood has shared his thoughts ahead of his team's visit to Crystal Palace on Saturday. Here's what he had to say...

On selections: "We're pretty healthy at the moment. Carles Gil and Jack Grealish came through an U21s game on Monday. [Jores] Okore and [Jose Angel] Crespo won't be fit. A few need some more training sessions. Adama Traore is fit. Hopefully we'll see him at some stage this season."

On transfers: "The average age of our signings this summer is 23. We're building for the future."  

On Crystal Palace: "They are an established Premier League side. In the second half of last season they were brilliant. They have a lot of pace on the counter-attack."

Image source, EPA