Colin Kaepernick, who underwent surgery on Tuesday, had an "extensive" tear in his labrum.
Kaepernick’s recovery is expected to last four to six months.
Kaepernick will go through the rehab process with the San Francisco 49ers.
Kaepernick was placed on injured reserve Saturday and the 49ers will move forward this season with a quarterback corps that includes Blaine Gabbert, Dylan Thompson and McLeod Bethel-Thompson.
Kaepernick injured the shoulder in a Week 4 loss to the Packers.