|Nov 27, 2019
||Knee Patella Sprain
||Pettis sprained his left knee during the 49ers' practice ahead of the game against the Ravens. He missed two games with the injury
|Dec 23, 2018
||Knee MCL Sprain Grade 2
||Pettis sprained his left MCL in Week 16 and missed the finale.
|Sep 30, 2018
||Knee Strain Grade 1
||Pettis missed 3 games with a left knee injury.
|Nov 25, 2017
||Pedal Ankle Sprain Grade 2
||Pettis injured his left ankle in his final regular-season game at Washington. He played in the team's bowl game but was unable to work out at the Combine or his Pro Day.