Although the St. Louis Rams don't have official confirmation yet, coach Jeff Fisher said after Saturday's game that running back Isaiah Pead likely will miss the rest of the season with a torn ACL in his left knee.

"It appears that we've lost Isaiah with an ACL [tear]," Fisher said. "We'll have to talk to our doctors. It's unlikely that he has not torn his ACL, which is very tough for him. ... It's unfortunate that happened. So we'll just hope for the best as far as that's concerned."

Pead suffered the injury while returning a kickoff after Green Bay scored on the opening drive of its 21-7 win Saturday.

With less than 10 minutes to go in the first quarter, Pead took the kick down the left sideline where fellow running back Benny Cunningham had opened a hole with a big block. Pead appeared to trip as he attempted a jump-cut, the field grabbed hold of his foot and his knee buckled.