GREEN BAY, Wis. -- The injury that rookie tight end Colt Lyerla sustained Saturday in the Green Bay Packers' Family Night practice at Lambeau Field was to his knee, and the initial diagnosis was just a sprain.

His agent, Vinnie Porter, said Sunday that Lyerla was scheduled to undergo an MRI to confirm that.

If the test shows no further damage, there's a chance Lyerla could return before the preseason ends, which would keep alive his bid to make the roster.

After a slow start to training camp, the undrafted rookie had begun to show signs of why the Packers took a chance on him after his college career at Oregon ended in midseason last year when he left the team.

In fact, his athleticism was on display when he was injured Saturday night. He caught a short pass from quarterback Matt Flynn and then hurdled cornerback Jumal Rolle. However, Lyerla appeared to be injured at the end of the play when he was hit by cornerback Jarrett Bush.

"There's a time for the opportunity to hurdle the defender, and I think that was probably not the right time," Packers coach Mike McCarthy said.

Lyerla said he was just trying to make the most of an opportunity.

"I kind of had a little bit of an adrenaline rush," Lyerla said. "And I was just trying to show a little bit of my athleticism."