The Houston Rockets remain without Omer Asik and are not sure why the center has been unable to make enough progress to return from his knee injury.

Asik has made progress in his knee injury and increase his workouts, but his knee reportedly swells up afterward. The Rockets have sent Asik for multiple MRI exams and another expert to get an idea of why the problem has remained persistent.

“He had some swelling again in his knee,” Kevin McHale said. “It seems like he amps it up to a certain level and it swells up again. They’re still trying to figure out what’s causing that swelling when he gets up to a certain level of activity. They MRI, they sent it out again for certain people to look at again. His symptoms are not going the way the doctors think they should be.”

Asik has reportedly requested multiple trades since the offseason.