The Calgary Stampeders' depleted offensive line took a major loss during Tuesday's win.
Fourth-year veteran Derek Armstrong, nicknamed 'Army', re-injured his tricep muscle and is headed for surgery, a blow for a group already without two starters for the majority of training camp.
"He's had an MRI already and it looks like he will need an operation on his tricep," said Stamps head coach John Hufnagel. "It's a serious matter and he will be out a significant amount of time."
Armstrong started Tuesday's 27-19 pre-season victory over the Saskatchewan Roughriders at left guard in place of Jesse Newman, who suffered an ankle injury before camp even started.
The line is also working without their longest-serving player in Jeff Pilon. The right tackle injured his knee on the first day of camp and has sat out ever since.
If Newman and Pilon can't play in the regular-season opener July 1 against the Montreal Alouettes, Hufnagel will have some juggling to do.
"For the past two weeks, I've had a major concern with our team and it's not getting any better," Hufnagel said.
Hufnagel's plan will be in place today when final roster cutdown is announced.
Newman and Pilon could be put on the 46-man roster to give them time to come back, or it could be Plan C time.
Fifth-year veteran Godfrey Ellis is filling in for Pilon at right tackle, but he could move over to left guard and make way for either Antonio Hall or Ben Archibald, who started at left tackle.
Both of those players are imports, and starting them at the same time would mean adjusting the roster elsewhere.
Canadian rookies Jon Gott or John Hashem could also get called upon to fill in.