The recovery time is approximately six months and the hope is that Romero will be able to participate in next year's Spring Training. Romero is under contract for another season at $7.5 million.
Romero has been dealing with knee issues for the past two seasons. He had platelet enrichment treatment (PRP) during the offseason, but the discomfort continued to linger and likely is something Romero will have to deal with the rest of his career.
The 29-year-old Romero is the former ace of the Blue Jays' pitching staff, but he has fallen on hard times the past three years. He had an 0-3 record with a 5.50 ERA and 42 walks in 37 2/3 innings for the Bisons this season.
Gregor Chisholm is a reporter for MLB.com. Read his blog, North of the Border, and follow him on Twitter @gregorMLB. This story was not subject to the approval of Major League Baseball or its clubs.