SAN DIEGO -- San Diego Chargers free safety Michael Dumas tore the anterior cruciate ligament in his left knee in practice Thursday and will miss the rest of the season.
Surgery hasn't been scheduled, but is expected to be performed next week, the team said.
Greg Jackson is expected to take Dumas' spot in the starting lineup.
Dumas was ejected from Sunday's 23-7 loss at Kansas City after an altercation with Kevin Lockett.
Meanwhile, embattled rookie quarterback Ryan Leaf blew by reporters on Thursday and said, "I'm not talking to the media."
On Monday, Leaf had an obscenity laced blowup at a reporter who noted in that day's newspaper that the quarterback directed obscenities toward a cameraman who was taping interviews following the loss at Kansas City. The cameraman works for "Chargers Report," one of the team's weekly TV shows.
Leaf, who was a broadcasting major at Washington State, was hustled out of the locker room Monday by linebacker Junior Seau, but a portion of the incident was taped by a TV cameraman.
Leaf had the worst performance ever by a Chargers quarterback Sunday, completing just 1 of 15 passes for 4 yards and turning the ball over five times on the first seven possessions.
Chargers spokesman Bill Johnston said Leaf's anti-media stance wasn't permanent and that team officials plan to talk with him about it Friday.
San Diego (2-1) faces the New York Giants (1-2) on Sunday. The game will be blacked out locally because 11,300 tickets remained to be sold by the Thursday afternoon deadline.