Riley Reiff seemed like the kind of guy who definitely would be signed prior to the start of training camp. They all say it when they’re drafted, but some you can tell actually mean it.

Reiff, the Lions’ first-round draft pick, signed a four-year $7.993 million contract on Monday. He’ll be a go when training camp opens on Friday at the Lions’ Allen Park practice facility.

All rookies and injured players reported on Monday. The remaining players report on Thursday.

Reiff said it was important to him to report with the rest of the rookies who have all been signed previously.

“I didn’t want to miss any time. I thought it was a big part of this whole process to get it done by the time training camp started,’’ Reiff said.

During rookie camp, the organized team activities and the team minicamp, Reiff lined up at left and right tackle.

Offensive coordinator Scott Linehan said in June that Reiff was on track to play “a lot of football for us really early.’’

After all, he was a first-round pick.

General manager Martin Mayhew said Reiff could be used at tackle or guard, but Reiff has not lined up at guard and said no one has spoken to him about making the move.

Reiff, who made the long drive to Detroit from South Dakota, is expected to eventually take over the left tackle position from Jeff Backus who is 34. That won’t necessarily happen this season though.

Reiff’s progress in training camp and the preseason games will determine just how he’ll be used. Possibly he could compete for the start at right tackle with Gosder Cherilus.

Greenwood on PUP

Rookie cornerback Chris Greenwood, the fifth-round pick out of Albion, will start the season on the physically unable to perform list.

Greenwood underwent surgery following a tear to a lower abdominal muscle during organized team activities in May, per a report from the Lions web site.

Greenwood is rehabbing and said he’ll be back sooner rather than later. Gone now are his slim chances of earning the starting role opposite Chris Houston now that Aaron Berry has been cut.

(Follow @PaulaPasche on Twitter. Read her Lions Lowdown blog at oplions.blogspot.com. Get Lions news delivered directly to your phone by texting the keyword "Lions" to 22700. Msg & Data Rates May Apply. Text HELP for help. Text STOP to cancel.)