The Blue Jays outrighted Luplow to Triple-A Buffalo on Sunday, Mike Wilner of the Toronto Star reports.
The 29-year-old was optioned to the affiliate April 17 and will remain there after losing his spot on Toronto's 40-man roster. Luplow played in just four games while up with the Blue Jays early this season and went 0-for-6 with a walk, a run and four strikeouts.