Carolina Panthers linebacker Luke Kuechly left Thursday night's game against the Philadelphia Eagles in the second quarter and is being evaluated for a concussion, according to the Charlotte Observer's Joe Person.
Kuechly is the NFL's premier middle linebacker with four Pro Bowl nods and three All-Pro First Team selections to his credit.
He has continued to be the linchpin of Carolina's defense this season, entering Thursday with 42 total tackles, a forced fumble and an interception.
The former Boston College standout was a model of consistency by starting all 16 games in each of his first three NFL seasons, but remaining healthy has been far more difficult in recent years.