Is this going to be Mourinho's biggest mistake at Chelsea?

Kevin De Bruyne

Whilst Jose Mourinho has reinstated Juan Mata into his team, Belgian Kevin de Bruyne is sat on the sidelines and could leave Stamford Bridge

Most people have got what they wanted - Juan Mata is back in the Chelsea side and Jose Mourinho seems ready to rely on arguably his best player. However, the result is that Mourinho has landed himself with another issue, as Kevin de Bruyne continually sits on the sidelines.

The 22-year-old Belgian playmaker, bought by Andre Villas-Boas from Genk in January 2012, spent the entirety of last season on loan at Werder Bremen, where he contributed ten goals and ten assists in just 34 games and was expected to contribute heavily under Mourinho this season.

But having seen De Bruyne omitted from Chelsea's trip to Romania to face Steaua Bucharest last week, speculation of a return to Germany arose. His agent, for now, claims he is going nowhere.

'This summer we decided to stay with Chelsea, and we knew the competition would be hard and that Kevin had to fight,' Sky Sports quote de Bruyne's representative to have said. 'He will continue fighting. I have no contact to other clubs. Even if we were in the transfer period, I would not have any contact.'

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Mourinho may risk losing one of his young talents due to the perpetual omission from the first-team set-up and it's predominantly a result of his own doing.

The purchases of Andre Schurrle and Willian over the summer looked like luxury signings at the time, and with Mata and now De Bruyne consigned to the sidelines, it's causing disharmony as six internationals compete for three spots in the team. All want to be playing regularly as they make their attempts to play in next summer's World Cup and De Bruyne looks like being the odd man out as things currently stand.

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Losing de Bruyne would be a monumental error from Mourinho, as he has the potential to be a top playmaker for years to come. His ability to pass, dribble and control the ball, creating chances in the process will only get better in time, and selling him would come back to haunt the Blues as de Bruyne develops and another club benefits. Another loan deal would suit Chelsea, but will de Bruyne believe his long-term future lies at Stamford Bridge?

Should Mourinho wish to sell him, he wouldn't be short of suitors, despite Borussia Dortmund boss Jurgen Klopp admitting that he is no longer interested having signed Henrikh Mkhitaryan in the summer.

'We have signed great players over the summer, we have a squad we are very happy with,' said Klopp. 'He [De Bruyne] is actually no one we are after. He is at Chelsea FC and given the size and quality of the Chelsea FC first-team squad it's quite usual he may sometimes miss out on one or two matches.'

While Dortmund may have ruled themselves out, de Bruyne - in this year alone - saw himself linked with a plethora of Bundesliga sides including Bayer Leverkusen, Wolfsburg and Werder Bremen.

image: © Erik Daniel Drost

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