By Matt Barlow

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It has become the riddle of the summer. How on earth did Juan Mata slide from being Chelsea's player of the year to the fringe of the team?

Supporters are certainly baffled, as are rival managers who made enquiries about signing the 25-year-old after he was left out of the team at Manchester United on Monday.

Tottenham were quick to let it be known they were interested and Arsene Wenger went as far as to admit Mata 'could be on the market'.

Playmaker: Juan Mata (right) looks set for a bit-part role at Chelsea after his heroics in the past two years

Playmaker: Juan Mata (right) looks set for a bit-part role at Chelsea after his heroics in the past two years

Watching: Jose Mourinho says he wants to keep Mata, but the Spaniard has barely featured this season

Watching: Jose Mourinho says he wants to keep Mata, but the Spaniard has barely featured this season

Three amigos: But Mata hasn't taken up his usual space alongside Oscar (left) and Eden Hazard

Chelsea and Jose Mourinho deny they want to sell and Mata does not want to leave but he is intelligent and mature enough to work it out for himself.

He is not someone prone to tantrums or to demand showdown talks and accepts that he missed early pre-season and Chelsea's tour of Asia after international duty at the Confederations Cup.

He also realises there has been managerial change and he will need time to understand what Mourinho expects of him.

Barring an unforeseen chain of events, Mata will not leave Stamford Bridge before Monday's deadline but he will reassess his position in January.

Mourinho wants to play high-tempo and intense football and this includes a tireless work ethic from the four most advanced players in his 4-2-3-1 formation.

The glory: Mata has been Chelsea's shining light in his two years at the club

The glory: Mata has been Chelsea's shining light in his two years at the club

Silverware: Mata (left) lifting the Europa League trophy with team-mates last season

Silverware: Mata (left) lifting the Europa League trophy with team-mates last season

Jump for joy: Mata has been Chelsea's Player of the Year for the past two seasons since his arrival

Jump for joy: Mata has been Chelsea's Player of the Year for the past two seasons since his arrival

It is the reason behind his pursuit of Wayne Rooney and his decision to move for Samuel Eto'o, who performed such a role for him at Inter.

Willian, who completed his move to Chelsea on Wednesday after acquiring a work permit, may not be combative like Rooney but he is quick and willing to close down spaces.

Mata, it must be said, does not do this. In fact, he rarely contributes off the ball.

After hijacking Willian's transfer to Tottenham last week, Mourinho rejected the idea he wanted Mata out and stressed he would need many quality players for these positions to achieve what he was after.

New signings: Mata will have to compete for playing time with Andre Schurrle and Willian (below)

New signings: Mata will have to compete for playing time with Andre Schurrle and Willian (below)

This week, however, Chelsea were in talks for yet another winger: Christian Atsu, a 21-year-old Ghanaian international from Porto.

Mata appears to be staring at the prospect of being the new Joe Cole, gifted footballer and darling of the fans but under-appreciated by Mourinho and certainly not central to his plans.

One significant difference is that Roman Abramovich adores Mata as one of the few recruitment successes of the post-Mourinho era and one of the creative forces who brought attractive football to Stamford Bridge.

Wenger, having been so close to signing Mata when he left Valencia in 2011, will monitor the situation closely and has asked to be kept update on any developments.

First time around: Mourinho tried to teach Joe Cole to play more for beneficially for the team

First time around: Mourinho tried to teach Joe Cole to play more for beneficially for the team

Mata's father (also his agent) was spotted at the Emirates as Arsenal beat Fenerbahce in the Champions League on Tuesday.

Villas-Boas, the Chelsea manager responsible for identifying Mata, is also keen but on Wednesday rejected the idea that Mourinho would sell an influential player to a fierce rival like Tottenham.

'Mata is a great, great player and very, very important for Chelsea,' said the Spurs boss. 'They are not just going to strengthen another team who they think are rivals for the title.'

Work ethic: Mourinho will want Mata, challenging Christian Benteke, to add a defensive element to his game

Work ethic: Mourinho will want Mata, challenging Christian Benteke, to add a defensive element to his game

The idea that Mata may be available to teams outside England is supported by reports in Spain this week that he was offered to Atletico Madrid.

One outcome which may appeal to Mourinho (if not Chelsea fans) would be to swap Mata for Rooney, but Chelsea appear to have accepted defeat on Rooney.

And so it remains a riddle.

The comments below have not been moderated.

He's too much of an attack-minded player Moribundho.

Oh dear. Matt Barlow. Enough said.

This is so funny. Last season every shock horror story featured how on earth Chelsea under Benitez could field a side without starting Lampard. Now he is playing surprise, surprise the focus is now on Mata. After only 3 games! Mata has played non-stop football for almost 2 years, and missed much of the pre-season. It would have been a risk to have played him against Utd when clearly Mourinho was thinking midfield=workmanlike. Why invent a crisis from a standard use of a talented squad?

Please do not trade Mata he is one of the best players chelsea has had it has been a good combination with the other players - I think the rest of Chelsea fans agree

Do these 'journalists' really believe that we think what they have written is factual as it is all utter tripe. Mata has been injured so this is a pointless article, as was the one where suarez was looking unhappy when in reality he spent training grinning and laughing, the countless occassions of teams 'missing' out on targets when the mail had made the rumour up or copied it off a dogy twitter page, bale turning up at 'spanish' hotels that happen to be flying the welsh dragon on the mast outside etc etc etc, all rubbish.

Cracking little player.Would love to see him at Old Trafford.

I don't understand what all the hype is about ? Mata missed half of preseason and then was injured for the start of it. He played against villa and wasn't necessary against united because of tactics. Chill the hell out you silly writers your just looking to stoke a fire that isn't there. The other players have been playing and playing well, mata has to earn his spot. Get half a football mind. He is and was one of our best players last season but were on top of the league so what's the problem? It's the beauty of having a squad that finally has depth ! We will be playing over 60 games again this season. Everyone will have eir chance. Pft. 3 games in and it's the end of the world. Talk about total hype!

Should Mata start in the Super Cup and play every game after that if fit I guess the DM will be tending an apology to Jose and Mata for the continuous hounding and nonsensical myths being spouted?

high tempo i think not...haven't played an exciting game yet..lucky to get a point at manchester and should have only had one against villa...might not lose but boring boring boring football

It's Mourinho's retribution after spending three miserable years in Spain, he hates everything that is Spainish. Chelsea's Spanish players, you can kiss goodbye to your careers.

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