The Chelsea boss says he will require cover if one of his players departs, but after several clubs showing interest in snapping up Mata during the summer, the only option he'd have open to him would be a move abroad.

"The window is open and when the window is open anything can happen," Mourinho said.

"We don't think a lot will happen for us. Do we have to react to certain things? Yes. If someone really wants to leave and someone leaves we probably have to bring someone in but we are going to do things in a very calm way."

Mata was furious at being substituted in the 53rd minute of Chelsea's 3-0 win, which came courtesy of goals from Oscar, Willian and Fernando Torres.

The former Valencia man, who has started just nine Premier League games this term, did not shake Mourinho's hand after leaving the field and he then gesticulated towards the pitch, where his manager was standing, from the bench.

And with the Blues unwilling to sell to any of their league rivals, the only two options that do look feasible for the midfield ace would be a switch to either Inter Milan or French club Paris Saint-Germain, who are both reportedly interested in securing his signature.

According to reports in Italy, the Serie A side are interested in the 25 year old, with source claiming they were ready to offer £12m, a slim sum compared to the £30m ready to be offered by PSG.