If the Green Bay Packers want to use their first round draft choice on a replacement for soon-to-be-leaving DE Cullen Jenkins, then Ohio State's DE Cameron Heyward is one option. He underwent Tommy John surgery in January, and was just able to conduct his first post-surgery workout.
He could probably play as an undersized defensive tackle in a 4-3 defense, so while Heyward's listed as a DE, he's similar to someone like Temple's DT Muhammad Wilkerson. Both players might be well suited to play five technique (lined up over the offensive tackle) in a 3-4 defense. While both players can man the position, neither may be able to rush the quarterback like Jenkins. Both players would likely do the grunt work of occupying blockers so that the linebackers can make a play.
Derek Harper pointed out that the Steelers sent Mike Tomlin and Dick LeBeau to Heyward's workout. While the Packers might need a replacement for Jenkins, the Steelers might need a replacement for DE Aaron Smith. While Smith has had a great career for the Steelers, he's about to turn 35, and he's missed most of the last two seasons due to injuries.