Cavs guard Irving out with concussion.

CLEVELAND (AP) — Cavaliers rookie Kyrie Irving has his first NBA injury — a concussion.

The star guard, who has lived up to being the No. 1 pick in this year’s draft, was kept out of Wednesday night’s game against the Los Angeles Clippers with a head injury. The team did not disclose Irving’s concussion until moments before tip-off. There is no immediate timetable for his return.

The Cavaliers said in a release that Irving was kneed in the head during the fourth quarter of Tuesday’s game at Miami. He complained of a headache after the game and that it worsened overnight and while he warmed up on the floor Wednesday.