Green Bay Head Coach Mike McCarthy says Jennings went through a number of drills Wednesday, but he was not on the field for the portion open to the media.
Not having Jennings would be a big blow for an offense that struggled to find it's rhythm Sunday in a loss to the 49ers.
"Greg Jenning is a very good football player, number one," McCarthy said Wednesday. "He has played well against the Bears. Just his route-running and his ability to catch the football, and make the first guy miss is unique."
McCarthy says Green Bay says the way the team has handled its perimeter players helps them cope with injuries.
"All of our receivers play all four positions, so that is something that we'll continue to do and move them around."
So what will be the determining factor Thursday?
"Communication tomorrow," says McCarthy. "I'll trust the communication between Greg and the medical staff. So that is when the decision will be made."