Ray Gionta, Massaro's coach at Marple Newtown, said Massaro was "feeling OK" but "bummed" when he spoke with him Saturday over the telephone.
"There was more swelling [Saturday] than [Friday], but he said he has no pain and can walk," Gionta said. "They don't think the injury is as intense as the last one, but we'll know more soon."
An MRI had been scheduled for Saturday but was put back until Monday, Gionta said.
"Hopefully it's not as bad as initially thought, but you assume the worst and hope for the best," he said.
It is likely that the 6-foot-4 Massaro, who opened spring practice at 264 pounds, nine more than his playing weight last season, will not participate in any drills for the remainder of the spring.
Massaro started the last 11 games of 2010, ranking second on the team with 31/2 sacks and fourth with eight tackles for loss. He finished with 37 tackles, 20 of them solo.
Massaro was the second Penn State player from the Philadelphia area to go down in the last week. On Wednesday, wide receiver Curtis Drake of West Catholic High suffered a left leg injury, described in reports as similar to the left tibia fracture he suffered last August. He will sit out the rest of the spring, and his status for the regular season is questionable.
Contact staff writer Joe Juliano at 215-854-4494