Montreal Alouettes quarterback Anthony Calvillo was knocked out of Saturday's loss to Saskatchewan Roughriders with a suspected concussion after a hit from defensive end Ricky Foley.
Trailing 7-3 in the third quarter, the Alouettes had moved from their own 37-yard line to Saskatchewan's 37 when Calvillo went down. He'd completed four of eight passes for 85 yards at the time of his injury.
"I've got a headache, I felt it right when I got hit and from there it hasn't gone away so they just kept me away from the game," said Calvillo, who added that he didn't remember being hit but didn't think the impact with the ground was what caused his injury.
"I'm assuming that it is [a concussion]."
The Alouettes went on to fall 24-21 after a 36-yard last-second field goal by Saskatchewan's Chirs Milo.
Calvillo had not been formally diagnosed in the minutes immediately after the game and said his status for Montreal's game against the B.C. Lions on Thursday would be determined later in the week..
Calvillo was replaced by Josh Neiswander, who saw his first regular-season action at QB with the Alouettes after signing with them in 2011.
Montreal's injured list continued to grow before halftime when Brandon London took a helmet-to-helmet hit from Roughriders safety Tyron Brackenridge.
Alouettes linebacker Kyries Hebert was sidelined on the same drive after he was kneed in the head by teammate Martin Bedard while covering a punt.
Saskatchewan wasn't immune to the injury bug either, as wide receiver Rob Bagg went down just before halftime after appearing to injure his left knee on a routine blocking assignment.
Bagg had season-ending surgery last year to repair a torn ACL in the same knee.