Collins (abdomen) was placed on injured reserve Tuesday, ending his season, John Boyle of the Seahawks' official site reports.
The Seahawks signed running back Josh Johnson off the practice squad to join the roster as a replacement for Collins, who has been troubled by the abdominal injury off and on throughout the season. Prior to being sidelined for four out of Seattle's last five games -- three times due to the injury and once due to a stint on the reserve/COVID-19 list -- Collins had picked up six starts in the wake of Chris Carson's season-ending neck injury. Despite the big opportunity afforded to him, Collins averaged a pedestrian 3.8 yards per carry and found the end zone only twice over his 11 appearances on the season. His absences in recent weeks opened up more work for Rashaad Penny, who has seized control of the lead role out of the backfield with three games of 130-plus rushing yards in his last four outings.