David Santiago, el Nuevo Herald, Associated Press
LeBron James drives against Kyrie Irving during the first quarter of the Cleveland Cavaliers vs. Miami Heat game at the American Airlines Arena in Miami on Feb. 7, 2012.

CLEVELAND — Cavaliers rookie guard Kyrie Irving has a concussion and is being kept out of Cleveland's game against the Los Angeles Clippers.

The Cavs announced Irving's injury a few minutes before tip-off Wednesday night. The team said Irving was kneed in the head during the fourth quarter of Tuesday night's game at Miami. He experienced a headache that worsened overnight and during pregame activity on the court. The Cavs said he has been diagnosed with a concussion.

Cavaliers coach Byron Scott did not mention anything about Irving during his pregame press briefing.

Ramon Sessions started for Irving, the No. 1 overall pick in this year's draft who is averaging 18 points and 5.1 assists per game.