After this morning's Green Bay Packers practice, Coach McCarthy said Clay Matthews missed practice due to knee soreness.

McCarthy: Clay Matthews missed practice today with some knee soreness. Going through rehab phase. #PackersCamp

— Green Bay Packers (@packers) August 3, 2015

Instead of practicing, Matthews spent the day in rehab mode.

This practice season is the first time #52 has been able to practice the inside linebacker position which was added to his responsibilities midway through last season. For the last five and a half years, Matthews has been used almost exclusively as an outside linebacker.