Chelsea are plotting a £75m move to sign Thomas Muller to replace Diego Costa
Muller, 27, has struggled to hold down a regular first team place under Carlo Ancelotti this season and has admitted that he is unhappy.
The World Cup winner has only scored once in the Bundesliga this season compared with the 20 that he got last season under Pep Guardiola.
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Chelsea owner Roman Abramovich insists Costa is not for sale
He found himself dropped for a top-of-the table clash with RB Leipzig before German football went into their winter break.
It has alerted Manchester United and Manchester City, and now Chelsea, who dropped Costa for yesterday’s win over Leicester City.
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Costa's agent Jorge Mendes is trying to engineer a big-money move to China
Costa, the Premier League's leading scorer who is subject to a £30million a year offer to move to China, had a training ground row with Antonio Conte.
Blues owner Roman Abramovich is adamant that the Spanish international isn’t for sale even for the £80m that Tianjin Quanjian are willing to pay.
But Costa’s agent Jorge Mendes is currently in China looking to engineer a move with Quanjian chairman Shu Yuhui determined that he gets his man.
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It has led to frantic moves behind the scenes at Stamford Bridge to start a desperate search for a replacement.
Chelsea know that their bid to win the Premier League title is at stake as Costa is their man goalscoring threat has scored 14 goals in 19 starts this season.
Muller could be the answer to their problems especially since things have turned sour for him with Bayern this season.