49ers' Davis, Crabtree in altercation

SANTA CLARA, Calif. (AP) - Mike Singletary had to separate tight end Vernon Davis and wide receiver Michael Crabtree after the players got into a heated discussion at practice Wednesday.

Singletary says the issue was non-football related and is closed. He met with both players.

Neither Crabtree nor Davis has played this preseason because of injuries and Singletary ruled out Davis for Thursday night's preseason finale against San Diego.

Crabtree's status is uncertain. The second-year receiver is nursing a neck injury and hasn't addressed it or spoken formally since the start of camp Aug. 1, declining multiple media requests. Yet the 49ers' website posted a lengthy story quoting him Tuesday afternoon.