Perez suffered a torn ulnar collateral ligament in his left elbow during a game against the White Sox on July 8. He is now expected to be out for at least the next 12 months.
Surgery became the recommended course of action during the All-Star break, but Perez was sent for a second opinion with renowned surgeon Dr. James Andrews just to make sure surgery was the only option.
"I think in this case, while it's the worst feared, it's a very clear-cut path going forward, and the reconstructive surgery is a successful one," Blue Jays manager John Farrell said. "It's been proven time over time, and yet it's still going to be roughly 12 months before Luis would be able to return to us."
Perez will become the second Blue Jays pitcher to undergo Tommy John surgery this year after Kyle Drabek suffered a similar fate in June. Perez also joins Sergio Santos, Brandon Morrow, Drew Hutchison and Jesse Litsch as Toronto pitchers who have suffered severe injuries this season.
Morrow and Hutchison are expected to recover later this year but Drabek, Litsch and now Perez aren't as certain of a commodity. That could leave the Blue Jays with some holes to fill during the offseason, but according to Farrell, that's the least of his concerns right now.
"We know this is a short-term game," Farrell said. "We'll have time to plan with who's targeted, who's either traded for, signed for, or targeted internally to take over spots.
"We've got some long-term injuries to rehab, but at this point, we're focused on tonight. There's always an eye to the big picture, but we'll address that at the appropriate time."