Bills RE Mark Anderson has undergone another procedure on his ailing knee, and will be sidelined an additional 2-3 weeks. It means Anderson will likely return Week 14 at the earliest, and is becoming a candidate for injured reserve. Anderson first went down in Week 5. Six months shy of his 30th birthday, Anderson is due a $1.5 million option bonus in the offseason. Chris Kelsay will continue to start opposite Mario Williams in his absence.

Bills RE Mark Anderson (knee surgery) has suffered a setback, and could require another surgery that would sideline him an additional 2-3 weeks. It's been pouring in Buffalo for weeks now. Anderson last played in Week 5, and will now be up against it to take the field before December. He's a $19.5 million investment that's yet to pay dividends for the sinking Bills. For now, Chris Kelsay will continue to start opposite Mario Williams.

Bills RE Mark Anderson (knee surgery) is inactive for Sunday's game against the Texans. Anderson has now been out a month. Chris Kelsay gets another start opposite Mario Williams, who says he is feeling fine after wrist surgery. The Bills will also be without RT Erik Pears (hip), giving Chris Hairston the nod. The rest of their inactives: K John Potter, QB Tarvaris Jackson, CB Terrence McGee, SS Delano Howell and OLB Kirk Morrison.

Bills RE Mark Anderson (knee surgery) isn't expected to return in Week 9. "(Thursday) will be the day and it's looking less and less likely," coach Chan Gailey said Wednesday. Mario Williams' expensive bookend remains week-to-week.

Bills coach Chan Gailey believes RE Mark Anderson (knee surgery) could return as early as Week 9. Anderson was given a "3-9 week" timetable after going down in Week 5, so Week 9 would be firmly within the realm of possibility. The Bills are on bye in Week 8. Mario Williams' expensive bookend, Anderson notched just one sack in five games before getting hurt.

Bills have declared RE Mark Anderson, OLs Kraig Urbik, Cordy Glenn, and Reggie Wells, LB Kirk Morrison, and DT Spencer Johnson inactive for Week 6 against the Cardinals. Anderson is out indefinitely with a knee injury, and veteran Chris Kelsay will get the start at right defensive end. Chris Hairston will start at left tackle, and Chad Rinehart gets the nod at right guard. Tarvaris Jackson is the third quarterback.

Head coach Chan Gailey gave RE Mark Anderson (knee surgery) a loose timetable for return at "three-to-nine weeks." "I'm probably wrong two or three weeks either way. I don't know where yet. I think once we get a week of rehab in we'll have a much better idea," said Gailey. This just confirms that it's not likely to be a season-ender for Anderson and the Bills. Veteran Chris Kelsay will fill in opposite Mario Williams in the meantime.

Bills RE Mark Anderson is out indefinitely after Monday's MRI apparently revealed extensive damage to his injured knee. There are no indications that this is a season-ender, but the Bills don't expect their $20 million addition playing anytime soon. Buffalo's offseason defensive makeover has backfired spectacularly, with Anderson's absence adding injury to insult. Through five weeks, the Bills rank 31st in both yards and points allowed. They're averaging two sacks per game. Anderson had one of those sacks and a dozen tackles. He figures to be replaced by Chris Kelsay.

Bills RE Mark Anderson is scheduled to have an MRI on his knee on Monday. Anderson was injured in Sunday's blowout loss to the 49ers. He has 12 tackles and a sack on the season so far. Anderson and Mario Williams, Buffalo's other high-priced defensive end, have combined for just 2.5 sacks.

Coach Chan Gailey insists DE Mark Anderson is "competing to play every snap" as opposed to being ticketed for a situational pass rushing role. "That's the way we watched him and looked at him," said Gailey. "You don't pay that kind of money to specialty players. You pay that kind of money to a guy that you think can be out there 50, 60 plays." Anderson will compete with quality run defender Chris Kelsay at right end. According to the Boston Globe, the Patriots' reaction to Anderson's four-year, $19.5 million contract was, "So long and good luck."