Patriots WR Wes Welker tore his ACL and MCL at the end of the 2009 regular season and made an impressive comeback to lightly participate in some of the Pats OTAs in June.
Welker isn't 100% so the Patriots will be placing him on the Physically Unable to Perform (PUP) list to start training camp.
This isn't quite the same as placing him on this list to start the regular season.
Welker can come off the list at any time during training camp and then he would immediately count against the 80-man camp roster. He doesn't count against the roster while on the PUP list.
If Welker is on the PUP list to start the regular season, he isn't eligible to return until week six. At that point, the Patriots could activate him within three weeks.
There have been varying opinions on Welker's return date. Some feel they'll start him off on the PUP list as he recovers from major knee surgery while others suggest he'll be active.