Blue Jays place newly acquired Jameson Taillon on injured list

Toronto's rotation reinforcement plan hit a snag fast. Taillon exited Monday's start against Boston after the top of the 4th with right forearm discomfort, and the Blue Jays made it official Tuesday, placing him on the 15-day injured list.

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Blue Jays Place Jameson Taillon On Injured List t.co/NHu3N1vS0f

The timing stings. Taillon, 34, was acquired from the Cubs on August 2 for a player to be named later, brought in specifically to shore up a rotation trying to survive a pennant race. He'd made just 2 starts as a Blue Jay, running a 3.38 ERA with 7 strikeouts across 8 innings, before the forearm barked.

Forearm tendinitis is the kind of injury that makes everyone hold their breath, since it's often the precursor diagnosis before something worse — like a UCL issue — gets found. For now the club is calling it tendinitis and not attaching a firm return timeline, but any forearm scare for a starter in his mid-30s is worth watching closely over the next few weeks.

Toronto recalled right-hander Chase Lee in the corresponding move to fill the roster spot, though that's a bullpen patch, not a rotation replacement. It's a reminder of how thin the margins are for contenders in August — you trade for length, and 9 days later you're scrambling to cover for it.

Zoom out and the bigger picture isn't pretty either. Between his time with the Cubs and Blue Jays this season, Taillon has a 5.96 ERA across 17 starts, so this wasn't a lockdown arm getting hurt — it was a struggling veteran the Jays were hoping would stabilize, now needing to first get healthy before he can do that. Toronto will need to figure out a rotation fix, whether internal or external, while he's out.