The Express are reporting that defender Felipe Luis is having second thoughts over his move to Chelsea and that he has told former teammate Miranda that life was better at Atletico Madrid.
The Brazil defender made a huge £16 million move to Stamford Bridge in the sumer but has not featured nearly as much as he would like.
Reports in Spain claim Luis has told Miranda, himself lined with moves to Chelsea and Manchester United recently, that he has made a mistake.
It is thought that Luis has come to realise how much he underestimated the influence that enigmatic manager Diego Simone has at Atletico.
Even more worryingly for Chelsea, it is claimed that Diego Costa, who has enjoyed a prolific start to life at Stamford Bridge, shares the defenders sentiments.
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Reports suggest that if Mourinho loses hold of Luis and Costa he could be facing a full-scale dressing room divide.
However, Luis took to social media to suggest that he remains happy to be at the West London club, so it will be interesting to see how this situation plays out.