The Sun says Mourinho had become increasingly frustrated by Terry's recent performances.

And he had even raised the issue with the club's medical department to see if they had an explanation.

But when centre-back Terry heard what Mourinho had done he reacted furiously.

And the England star had heated exchanges with the Blues boss before and after Tuesday's dire 1-1 Champions League draw at home to minnows Rosenborg.

A club source revealed: "News of their row reached the club's directors, who were concerned it was proof that Jose was losing the dressing room."