Greg Roman has said that Michael Crabtree is "working hard" on his recovery from an Achilles tear.

The San Francisco 49ers wide receiver sustained the injury during the team's minicamp earlier this year, but is optimistic of playing later in the season.

The offensive coordinator told reporters: "He's working hard. I don't think there's any specific day or date. If we can get him back this year, that'd be gravy.

"I think the way he's working now, it's quite possible, but again, I think you probably want to talk to the medical staff."

Quarterback Colin Kaepernick added: "I always check in with our receivers. He's a worker. He comes in and works every day. It doesn't surprise me at all."

Crabtree had 1,105 receiving yards and nine touchdowns for the 49ers last season.