Steve Slaton, left, and Chris Van Zeyl check on teammate Ricky Ray of the Toronto Argonauts during the CFL game against the Montreal Alouettes at Percival Molson Stadium on November 2, 2014 in Montreal.Minas Panagiotakis/Getty Images
Toronto Argonauts quarterback Ricky Ray is listed as doubtful for Friday's must-win home game against the Ottawa RedBlacks.
Ray suffered a concussion in a 17-14 loss in Montreal last Sunday.
Backup pivot Trevor Harris is expected to be under centre for the regular-season finale.
The Argonauts need a victory over Ottawa along with a Montreal win over the Hamilton Tiger-Cats to reach the post-season.
Ray leads the CFL with 4,595 passing yards this season.
Harris, meanwhile, has completed 16 of 24 passes for 168 yards.