The Saskatchewan Roughriders will be without quarterback Zach Collaros for this week's game against Montreal and perhaps several others
The Riders placed Collaros on the six-game injured list Tuesday, five days after he left Saskatchewan's Week 2 game against the Ottawa Redblacks with a head injury.
Collaros was acquired from the Hamilton Tiger-Cats this off-season. He was 18-of-25 passing for 203 yards and one touchdown in the Riders' season-opening 27-19 win over Toronto.
Collaros missed three games with a head injury in 2016 and was sidelined two years earlier due to a concussion.
It means Brandon Bridge is the starter for now.
Bridge completed 13-of-22 passes for 145 yards and an interception after Collaros left last week's game.