Portland, Ore. ? Portland Trail Blazers center Greg Oden will miss two to four weeks because of an injury to his right foot. The team said Wednesday that MRI and computerized axial tomography scans confirmed Oden has a mid-lateral foot sprain.

Oden, who missed all of last season after knee surgery, injured his foot in the first quarter of the Blazers’ 96-76 season-opening loss to the Los Angeles Lakers on Tuesday night.

“I was trying to go get a rebound, and kind of came down on Derek Fisher’s foot on like the third play of the game. I kind of fell and didn’t think twice about it,” he said after the game.

Oden missed four field goals and two free throws in 13 minutes.

The 7-foot center was the top pick in the 2007 draft. But even before his rookie season started, it was postponed by microfracture surgery on his right knee.

After he was held out last season, Oden rolled his ankle in the first practice of the fall. That injury wasn’t serious, however.

At Ohio State, Oden averaged 15.7 points and 9.6 rebounds, but Oden struggled with a wrist injury. He led the Buckeyes to the national championship game, scoring 25 points and grabbing 12 rebounds in the loss to Florida.