Dallas Cowboys defensive tackle Gerald McCoy ruptured his right quadriceps tendon during the first padded practice of training camp Monday and will undergo season-ending surgery, according to team executive vice president Stephen Jones.

McCoy was hurt during individual drills and was unable to put weight on his leg after he was examined by the team’s medical staff. Before ducking into the locker room, McCoy attempted to take some steps unassisted but could not. An MRI revealed the tear.

The Cowboys signed McCoy to a three-year, $18 million deal in free agency as part of a rebuild of their defensive line that also included the additions of Aldon SmithDontari Poe and Everson Griffen, who has yet to practice but has cleared COVID-19 testing protocol.