The Lakers don't know how long they'll be without forward Ron Artest, who fell down the stairs in his home on Christmas Night.

He suffered a concussion and hurt his elbow in the fall.

Artest didn't face the Kings on Saturday night and hasn't been cleared to play on Monday against the Suns.

"What I was telling the team is that he brings a certain physical presence to our game," coach Phil Jackson said. "And we'll miss that part of his game."

Artest is averaging 12.3 points, 4.8 rebounds and 4.0 assists per game this season.