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Jarrett, who finished with four catches for 36 yards, left the No. 3 Trojans' 20-3 victory over Arizona on Saturday in the third quarter. Earlier in the quarter, Jarrett caught his 32nd career touchdown pass to tie Stanford's Ken Margerum for the Pac-10 record.
"We'll miss him tremendously," Carroll said. "But the fact that Patrick [Turner] is ready to go is good. He and Vidal [Hazelton] will pick up the slack. But we're losing the all-time touchdown catcher in the history of the Pac-10, so that's quite a loss."
Jarrett, who has 20 receptions for 207 yards and three touchdowns this season, is technically listed as doubtful for next Saturday's game at Washington State, Carroll said.
Information from ESPN's Joe Schad and The Associated Press was used in this report.