MINNEAPOLIS (AP) — Minnesota Vikings running back Dalvin Cook’s availability this week for the game at winless Detroit is in doubt because of an injury to his left shoulder, but coach Mike Zimmer stopped short on Monday of confirming a long-term absence.

Cook was hurt on a carry late in the third quarter on Sunday at San Francisco and carted off in obvious pain. Zimmer said Cook did not sustain a torn labrum, an injury he had to the other shoulder two years ago, and did not rule out him playing against the Lions.

“It’s day to day. That’s what they’re telling me,” Zimmer said.

Cook has 773 rushing yards, 202 receiving yards and four touchdowns in nine games. He missed two games earlier this season with a sprained ankle, and his average of 4.5 yards per rush is the lowest of his five years in the league.