The Blue Jays just reversed yesterday's move entirely, and it's not a good sign for Jameson Taillon.

Ricky Tiedemann is back on the active roster. Taillon goes to the 15-day IL with right elbow inflammation.

Just yesterday, Toronto did the exact opposite, activating Taillon off the IL to start and optioning Tiedemann to Triple-A to clear the spot.

That flip in less than 24 hours confirms something went wrong fast during Taillon's start.

He'd already been dealing with discomfort that manager John Schneider said felt different than his previous injury, prompting an MRI right after the outing.

Elbow inflammation is the diagnosis that's come out of that imaging, a real concern for a pitcher who'd just cleared a forearm issue days earlier.

This kind of immediate reversal usually means the medical staff didn't like what they saw closely enough to wait even a single extra day.

Why this whiplash roster swing stings so much

Tiedemann gets pulled right back up after barely settling into his Triple-A assignment from yesterday.

For a rotation that's already absorbed injuries to Jose Berrios, Bowden Francis, Patrick Corbin, Trey Yesavage, and Shane Bieber this season, adding Taillon back to that list is a brutal continuation of the same pattern.

Toronto sits right in the thick of the wild-card race, making every single rotation move carry real weight right now.

There's no word yet on a specific recovery timeline for the elbow issue, or whether this represents something more serious than standard inflammation.

For a pitcher who'd made it through his rehab cleanly right up until this start, the speed of this reversal is the most concerning part.

Tiedemann, meanwhile, gets thrown right back into the fire after his own brief stint away, part of a roster that keeps cycling arms in and out by necessity rather than choice.

Whether Taillon's elbow issue resolves quickly or turns into a longer absence is the next real update Toronto's pitching staff needs.