There is legitimate cause for concern regarding the health of Percy Harvin.
Seattle Seahawks coach Pete Carroll told reporters Thursday that Harvin -- a surprise addition to the team's physically unable to perform list -- suffered a hip injury during a workout last week. Carroll said surgery has not been ruled out.
NFL.com's Ian Rapoport reported Harvin has a possible slight tear in the labrum of his hip, according to a source who is aware of the wide receiver's condition. Seahawks coach Pete Carroll later confirmed Rapoport's report.
"It's in that area, yeah," Carroll said. "We're going to take a real good look at it and get second opinions and all that kind of stuff, to do the right thing. It's really early in camp, we got plenty of time to get this thing worked out, so we're being very careful."
Carroll, as is his way, spoke with optimism. Still, surgery clearly is an option for Harvin at this time, although a source who regularly communicates with Harvin told Rapoport that wasn't the Seahawks doctor's recommendation. Harvin will receive a second opinion Tuesday, the source said.
"It may be. We'll find out," Carroll said of the possibility that Harvin will need surgery. "We're going to go ahead and take it step by step. I know he was working full speed just a few days ago. But we need to take care of him. We don't know enough information. The number of guys we have on PUP we have to be careful. We have to bring them back in good order and be diligent about the process right now."
Harvin had been a full-go in minicamp practices last month. The 25-year-old receiver missed the second half of last season with an ankle injury but had been believed to be back to 100 percent.
The Seahawks gave up multiple draft picks in March to secure Harvin in a trade with the Minnesota Vikings. The mercurial playmaker has missed time with injuries and migraines throughout his career, though he passed a physical with Seattle to finalize the trade.
Harvin widely was viewed as the final piece of the puzzle for a Seahawks team that's expected to make a run at the Super Bowl. It's officially worrying time in Seattle.
Follow Dan Hanzus on Twitter @DanHanzus.