Wizards star Gilbert Arenas sprained his left knee in a collision with Gerald Wallace in the first quarter of Wednesday night's 108-100 loss to the Charlotte Bobcats.

The three-time All-Star will have an MRI on Thursday to determine the full extent of the damage, but the recovery time from such injuries is usually measured in weeks, not days, and the Wizards have only eight games left in the regular season.

He was just standing there, settling into rebounding position as Wallace drove baseline. When Wallace threw up one of those incredible, off-balance reverse layups, he crashed inadvertently into the left leg of the Washington Wizards' guard.

The Wizards earlier this week lost All-Star forward Caron Butler to a broken his hand earlier this week, and they are 2-9 this season when he doesn't play. Butler is expected to miss at least six weeks, meaning he will play again only if Washington advances deep into the playoffs.