The Seattle Mariners are reportedly acquiring All-Star infielder/outfielder Brendan Donovan from the St. Louis Cardinals in a three-team trade that also involves the Tampa Bay Rays, ESPN’s Jeff Passan reports.

Per the New York Post’s Joel Sherman, the Mariners are sending pitching prospect Jurrangelo Cijntje to the Cardinals and third baseman Ben Williamson to the Rays in return.

Advertisement

According to Passan, St. Louis will also receive a pair of prospects, center fielder Tai Peete from Seattle and outfielder Colton Ledbetter from Tampa Bay, as well as two competitive-balance Round B picks, in the return for Donovan.

Donovan is a former Gold Glove winner who can play multiple positions in the infield and outfield. A four-year MLB pro, he has spent his entire career with the Cardinals and made his first All-Star team last season.

In 118 games in 2025, Donovan slashed .287/.353/.422 with 10 home runs, 50 RBI and 64 runs scored while frequently hitting leadoff. He has played 118-plus games in three of his four MLB seasons and has never played fewer than 95.

Advertisement

Donovan joins a Mariners team looking to build on its 2025 AL West championship and trip to the ALCS, in which it lost in seven games to the Toronto Blue Jays.

[Get more Mariners news: Seattle team feed]

The Mariners lost slugging third baseman Eugenio Suárez in free agency this winter. But Donovan will join a lineup that features All-Stars Cal Raleigh, Julio Rodríguez and Randy Arozarena and finished ninth in runs scored last season.

Donovan could replace Suárez at third base. He offers the Mariners a versatile glove that can fill in at multiple positions, in addition to a reliable bat that can hit near the top of the order.

Advertisement

What the Cardinals, Rays are getting in the deal

Per MLB.com, Cijntje was the No. 7 prospect in the Mariners’ system and the No. 90 prospect in all of baseball. He’s a switch pitcher who’s expected to pitch as a right-hander in the majors. It’s not clear when he’ll be ready to pitch for the Cardinals.

Peete was drafted by the Mariners in 2023 and spent the entire 2025 season with High-A Everett, where he slashed .213/.285/.401 with 19 home runs and 25 steals. Ledbetter was the Rays’ No. 24 prospect. Also drafted in 2023, he slashed .265/.337/.378 with 7 home runs and 37 stolen bases at Double-A Montgomery in 2025.

Advertisement

Williamson, 25, split his time between the Mariners and the minor leagues last season. He played in 85 Mariners game in his first season of big-league action, slashing .253/.294/.310 with 1 home run, 21 RBI and 36 runs scored in 295 plate appearances. He could join the Rays’ lineup this season.