John Stones' possible move to Everton has been plunged into doubt due to concerns over his injury issues and adaptation to their playing style.

What happened?

The England centre-back is about to become a free agent as he leaves Man City at the end of his contract.

Stones has proven himself as one of the best defenders in the Premier League over the last ten years since he left Everton to move to the Etihad Stadium.

Why it matters for John Stones

He has been linked with a move back to Merseyside, but former Man United chief scout Mick Brown told Football Insider that they remain undecided on a move due to several worries about his suitability.

Stones featured just 18 times across all competitions last season, with Pep Guardiola only handing him five Premier League starts despite being fit for the majority of the campaign.

What comes next?

Sources have told Football Insider that Everton have held internal talks about approaching Stones, with Bayern Munich also linked with a move.

“John Stones has a reputation as a person of being top class, and I have no reason to dispute that whatsoever, as I've heard that from some very good sources. But, you ain't on the team sheet," Brown exclusively told Football Insider.

He also recently turned 32, and would have to adapt to playing a completely different way if he were to join David Moyes' squad soon.

Stones started England's first World Cup clash against Croatia last week, and is playing for a move as he aims to deliver some long-awaited silverware to the country.

Moyes was asked about the selection of his former player live on talkSPORT as a reunion is mooted, and he defended the 32-year-old while praising his qualities.

He said: "I thought his team selection was really good. It was a bit surprising, maybe, to some people that John Stones started, since he hasn’t played an awful lot, but he is an exceptional player and Thomas likes him a lot.”

Stones has been playing in the Manchester City team who have the ball for nearly all of the match, but what's he like when the pressure's coming on him for 90 minutes, you know?

When it's incessant and you can't get out of your half, which is what can happen to Everton, or anybody else, most other Premier League clubs, it's a dilemma for whoever wants to take him.

Brown would struggle to justify that one, and would certainly see that one as a risk, but you know, we've seen what he can do in the Premier League when he is fit and he can be one of the best defenders in the league on his best day.

Everton's decision on John Stones will be crucial in determining the defender's future, and only time will tell if he will make a return to his former club.

The transfer window is open, and John Stones' next move is eagerly anticipated by fans and pundits alike.

On 18 Jun, Stones started for England in their World Cup opener, and his performance will be closely watched by potential suitors.

As the summer transfer window heats up, John Stones' future remains uncertain, with several top clubs vying for his signature.

David Moyes' comments on John Stones have sparked interest in a potential reunion, but the Everton manager will have to weigh up the risks and benefits of signing the experienced defender.

John Stones' injury issues and adaptation to Everton's playing style are major concerns, but his quality and experience make him an attractive prospect for several top clubs.

The England centre-back has a big decision to make, and his next move will be closely watched by fans and pundits alike.