According to Rick Stroud of the Tampa Bay Times, defensive end Da'Quan Bowers, defensive tackle Amobi Okoye and linebacker Adam Hayward will start the year on the physically unable to perform list. For Bowers and Okoye this comes as no surprise: Bowers suffered an Achilles injury in May, which is likely to keep him out for most or even all of the upcoming season. Meanwhile, Amobi Okoye had his knee scoped in June, which will linger for a few more weeks but shouldn't stop him from playing in all regular season games. Adam Hayward's presence on the PUP list is a bit more puzzling, as no reports of an injury have come out. At the same time, I can't recall his name coming up during earlier training camps as a possible starter, so this may not be a new development.
While players are on the PUP list, they are not allowed to practice. As soon as they participate in any practice, if only for a few minutes, they must come off the PUP list and are not allowed to join the PUP list later in the year. While on the PUP list, players do not take up a roster spot. The three players are now on the preseason PUP list, which means they could come off it at any time. If they are still on the PUP list once the season begins, they will have to miss the first six games of the regular season. After that, they will have three weeks to start practicing again, and another three weeks after they start practicing to be placed on the regular season roster.