Terry has not played since the win over Newcastle on 13th December and was again absent for the Boxing Day draw with Reading.
And following the 2-2 draw with The Royals, Mourinho revealed he does not know when Terry will be fit to return.
"I've no idea when John Terry will be back," said Mourinho.
"I want John to be back as soon as possible. The medical department will have to make a decision soon.
"The medical department have said surgery might be a possibility. I want them to make a quick decision.
"I don't know how long he will be out for - three days, three weeks or three months, I don't know."
And following the 2-2 draw with The Royals, Mourinho revealed he does not know when Terry will be fit to return.
"I've no idea when John Terry will be back," said Mourinho.
"I want John to be back as soon as possible. The medical department will have to make a decision soon.
"The medical department have said surgery might be a possibility. I want them to make a quick decision.
"I don't know how long he will be out for - three days, three weeks or three months, I don't know."
