Joakim Noah is attempting to be medically cleared to return from his left knee surgery in order to begin his 20-game suspension this season. 

Noah was cleared to return to practice on Monday by New York Knicks' doctors but the NBA has yet to determine if they'll clear him to play, which would then officially start his suspension.

“Right now, it’s just starting my suspension as soon as possible,” Noah said. “And moving on from this.”

Noah made a mistake in taking an over-the-counter supplement while recovering from one of his many injuries. It was that supplement that apparently resulted in the positive test, and Noah told reporters that it was not provided to him by the Knicks.

“I tried to take a supplement to help me with everything that I was going through,” said Noah. “I’ve gone through a lot of injuries, and I tried to take something to help me and it backfired. So I know it didn’t come from a bad place. I was working with the league on this for a while.

“I think that I got punished for 20 games is severe. But it is what it is, and I’ve got to bounce back.”

Noah admitted he made a mistake in taking the banned substance.

"I made a mistake. It was a tough year for me, for this team," Noah said after returning to practice Tuesday. "... I let a lot of people down. It was a mistake. And I gotta learn from it and bounce back. This is a tough moment and I'm going to learn from it."