Cobb worked out for the Packers this morning and was offered a contract, coach Mike McCarthy said.
"Our personnel guys said he had a great workout today," coach Mike McCarthy said. "We'll take a look at him this week and try to get him in the game."
Cobb (6-foot-1, 241-pounds) played in 49 career games over four years for Northwestern University. He began his career in 2003 as a linebacker before moving to fullback in 2004. Cobb was the team's starting tight end in 2005 and played ‘superback', a combination of tight end and fullback, as a senior in 2006. He also blocked two punts in 2006.
One of the Packers' fourth-round picks in the 2005 NFL Draft, Underwood played in 16 career games for Green Bay. He sustained a knee injury during the preseason last year, which required reconstructive surgery on his MCL and ACL, and missed all of last season.