PORTLAND, Ore. (AP) -- In just his second game with the Los Angeles Lakers, veteran guard Steve Nash injured his left knee against the Portland Trail Blazers.

Nash appeared to bump knees with Blazers rookie guard Damian Lillard late in the first half Wednesday night and limped off the court. He was helped to the locker room.

The Lakers initially reported the injury was not serious and Nash was able to play. But just 1:16 into the second half it was clear he was struggling and he headed back to the locker room.

The exact nature of the injury was not known. Nash was replaced by Steve Blake.

Nash had two points and four assists against the Blazers.