As a result of the concussion, MLB approved a roster move on Saturday, with right-hander Danny Barnes taking Liriano's spot. Rosters are reset for every postseason series and players with concussions are allowed to return during the following series, provided they have been out for a minimum of seven days.
The Blue Jays are evaluating the 32-year-old daily, and he must be cleared through MLB's concussion portocol prior to returning, should Toronto advance to the AL Championship Series. The Blue Jays took a 2-0 lead into the best-of-five ALDS on Sunday.
"The way they structure everything with the protocol, he's got to turn through a series of tests," said Blue Jays manager John Gibbons.