With uncertainty surrounding the condition of Carmelo Anthony's right knee, New York Knicks coach Mike Woodson admitted that he's "worried" about his star forward.

Anthony was in New York on Thursday to get fluid from his knee drained. The Knicks say Anthony had a "soft tissue fluid collection" removed from the back of his knee and is questionable for Sunday's game against the Los Angeles Clippers.

Anthony will miss the Knicks' game Thursday against Portland and has been sidelined for four of the Knicks' past six games because of the knee ailment.

"When a key guy goes down that's a big piece, a major piece to your puzzle, sure you've got to worry," Woodson said Thursday on ESPN New York 98.7 FM. "There's no doubt I'm worried. There's no doubt that I'm worried about Carmelo. But I'm worried about our team as a whole with how we're playing. Coming out of that Utah game at home these past two games have been a nightmare for all of us."

Anthony left Wednesday's game against the Denver Nuggets in the third quarter due to stiffness in his knee.