Green Bay Packers defensive end Mike Neal injured his left knee during Tuesday's practice.

Neal, who was expected to replace departed free agent Cullen Jenkins, got his feet tangled up in a non-contact drill and went down clutching his left knee.

"The way Mike fell; I saw it from the special teams drill, just the reaction of everybody. It makes you nervous," head coach Mike McCarthy said.

Neal, a second-round draft pick in 2010 out of Purdue, will have an MRI and other tests done on the knee.