Thin along the defensive line, the Patriots worked out defensive tackle Marcus Harrison and defensive end Pierre Allen on Thursday.
The 27-year old Harrison was a third-round pick of the Bears in 2008. At 6-foot-3, 316 pounds, he has played in 37 career games, including nine starts in 2009. However, Harrison played in only five games last season and was placed on the active/non-football injury list by Chicago this summer after reporting to training camp overweight. He was released during final cuts and was set to sign with the Panthers before failing a physical.
With Vince Wilfork held out of practice on Thursday for non-injury related reasons, and Mike Wright placed on injured reserve also on Thursday, the team was down to three defensive tackles in practice, including Kyle Love and Albert Haynesworth, who were listed as limited with a back injuries. Harrison is not practice squad eligible.
Allen, 23, was signed by the Seahawks this season as an undrafted free agent from Nebraska. At 6-foot-4, 273 pounds, Allen is considered more of an edge rusher, recording 3.5 sacks as a senior for the Cornhuskers. He briefly spent time on the Seahawks' injured reserve list with a hamstring injury to start the season before receiving an injury settlement.
The Patriots have four players on their 53-man roster at defensive end, as well as two on the practice squad (Alex Silvestro, Markell Carter).