The England ace's current contract expires in June.
"Naturally he will get his contract because he's a valuable player for us," Mourinho said.
"Even if you are not playing every game and you are not a first-choice player, like he was always, I don't think sometimes it means that you are not well, you are not in well conditions, you are not deserving a new contract.
"I feel he's fine. And I think tomorrow he's going to show that he's fine. He starts tomorrow."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball