"It was something that bothered him for a lot of the year," Garrett said per the team's official site. "He obviously played through it, but he was dealing with it a little bit."
Garrett did not set a definitive timetable on Lawrence's recovery.
"We expect him to be back fairly soon," he said regarding the defensive end. "We'll see. We don't want to put it definitively, but we think he's going to be OK."
In 2015, Lawrence led the team with eight sacks, recorded 55 tackles and finished second on the team with 31 quarterback pressures.