Update, 6:30 p.m. CT: Jeff Passan of ESPN has the full deal, with Cijntje and Tai Peete going from Seattle to St. Louis. Both teams sent a Comp B draft pick and the Rays sent OF Colton Ledbetter.

Update 4:51 CT: According to Adam Jude of the Seattle Times, the Cardinals are also receiving prospect Tai Peete in the deal. He was a first-round pick of the Mariners in 2023. It's unclear who else is involved, as the Rays haven't had anyone sent out yet, per reports.

Update, 4:40 p.m. CT: As of now, we know that Jurrangelo Cijntje is going to the Cardinals. That comes from Joel Sherman of the New York Post. Cijntje was a first-round pick of the Mariners in the 2024 draft out of Mississippi State and is one of those Top 100 prospects, according to MLB Pipeline. 

4:30 p.m. CT: After trading away Sonny Gray, Willson Contreras and Nolan Arenado, the St. Louis Cardinals continued their offseason teardown on Monday afternoon, trading away All-Star Brendan Donovan to the Seattle Mariners. The Tampa Bay Rays are also involved in the three-way trade, so the full return is not known as of this posting. We will update it when it becomes available.

Bob Nightengale of USA Today did add that the Rays are expected to get infielder Ben Williamson from the Mariners, but nothing more is known from the Cardinals perspective other than them giving up Donovan, who made the All-Star team in 2025 and finished as a runner-up for the Silver Slugger at the utility position.

The Mariners and San Francisco Giants had been two of the biggest suitors for Donovan this offseason, but the Giants seemingly bowed out this weekend when they signed three-time batting champion Luis Arraez to a one-year deal worth $12 million.

Seattle had been interested in Donovan since the start of the offseason, but that interest only grew after they lost Jorge Polanco in free agency to the New York Mets.

Donovan spent four years with the Cardinals, becoming one of the most well-liked players on the roster because of his grit and hustle. He had 10 homers and 50 RBIs last season while also posting a 13 percent strikeout rate. Seattle will hope his contact ability helps balance their homer and strikeout happy lineup.

The Mariners have one of the best farm systems in baseball, with MLB Pipeline giving them a league-best seven Top 100 prospects in its most recent rankings. ESPN and Baseball America are a little lower on the system as a whole, but there's still plenty of impact for the Cardinals to choose from.

St. Louis has done a nice job restocking its farm system this offseason, with Chaim Bloom generally focusing on pitching acquisitions (and salary relief) in prior deals. Bloom helped rebuild the Boston Red Sox, but he wasn't given a chance to see it through. St. Louis fans will need to have some patience with his plan, but there's reason to believe he can execute it if given the leeway.

After splitting from Main Street Sports earlier this offseason, the Cardinals got more clarity on their television situation for 2026. Fuller details will come out in the coming weeks.

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