"We have six days in shoulder pads and we have six full-padded practices in training camp. And we've already finished two of those shoulder-pads practices," Lions coach Jim Schwartz said. "Those are opportunities that, once they're gone, they're gone forever. You're not getting them back. ... That's the disappointing thing from his standpoint. That's work that you can't get back there."
Schwartz added: "His teammates want him out here. I'm sure he wants to be out there. But yeah, there comes a time when, particularly for linemen, where you need pads, where you need the work. We had two-a-days yesterday, we'll have two-a-days today. It's hard to replicate that in your own training."
Suh is the former Nebraska defensive lineman who was the No. 2 pick overall in the NFL draft.
The Lions have had only one player, Calvin Johnson, miss more than a couple days since Bryant Westbrook was a long-term holdout in 1997. Westbrook's agents were Roosevelt Barnes and Eugene Parker, both of whom are representing Suh.
"Both sides are working hard to get this resolved," Barnes wrote in an e-mail to The Associated Press.
Suh posted a message on his Twitter account Sunday that quoted a biblical passage: "Judge not by with appearances, but judge with the right judgment."
Information from ESPN.com's Kevin Seifert and The Associated Press was used in this report.