Blue Jays manager John Farrell said his replacement has yet to be determined, but that it will likely be another relief pitcher, meaning Toronto will continue working with an eight-man bullpen.
Over three appearances with the Blue Jays, Richmond allowed two runs -- both which came in one outing against the Red Sox -- while striking out two and walking none.
Richmond, a native of North Vancouver, B.C., started 15 games at Las Vegas, where he went 6-5 with a 5.46 ERA before being recalled to Toronto.
Farrell wouldn't tip any names as to who would be getting summoned to Toronto, but Triple-A relievers Chad Beck and Evan Crawford should be considered potential candidates.
They have both been up with the Blue Jays this season, as has Joel Carreno, who could be another option, but the Blue Jays may want to keep him for rotation depth, based on the rash of injuries that have plagued the team this season.
"We are still looking for that guy we can go to in the seventh inning when we are down a run or two to put up a zero," Farrell said.