Carolina Panthers starting left tackle Matt Kalil has undergone an arthroscopic procedure on his right knee, and is currently week-to-week, the team announced on Tuesday morning.
Kalil had been dealing with some soreness in the knee through training camp and missed a day in Spartanburg, as well as the last two days of practice.
The Panthers are currently without three starting offensive linemen: Right tackle Daryl Williams, guard Amini Silatolu and Kalil.
Williams tore his medial collateral ligament (MCL) and dislocated his patella the first week of training camp, and Silatolu tore his meniscus a week later.