Buffalo Bills receiver Percy Harvin's hip injury is more serious than initially thought, according to head coach Rex Ryan.

Ryan said Tuesday that Harvin had to have an injection to deal with the pain in his hip, but hopes he's ready to go by the team's Aug. 29 preseason game against the Pittsburgh Steelers.

Harvin just zipped through on a cart with his leg extended, someone else driving. Fred Jackson asks if he's good. Gives him a thumb's up. — Tyler Dunne (@TyDunne) August 19, 2015

Harvin has dealt with hip injuries in the past, missing most of 2013 after undergoing hip surgery. The Bills are experiencing a wave of offensive injuries with LeSean McCoy and Sammy Watkins also banged up.