There is a chance Tottenham could be without Harry Kane for Sunday's north London derby against Arsenal.
The England captain was forced to sit out the club's latest training session after picking up a knock and will miss Thursday's meeting with LASK in the Europa League.
Erik Lamela, Carlos Vinicius and Sergio Reguilon will also sit out the clash.
"They're all injured. Lamela is an injury of three weeks, a month. I don't believe he has a chance for the weekend," he told reporters.
"Harry, Vinicius and Sergio there is a chance for the weekend."
When asked if Kane's injury is serious enough to keep him out of Sunday's north London derby, Mourinho responded: "I'm not going to tell you the nature of his injury.
"I think he has a good chance [vs Arsenal]. I think he's going to play. That's my feeling."