The Seattle Mariners have emerged as one of two front-runners in trade talks with the St. Louis Cardinals for utilityman Brendan Donovan, The Athletic’s Katie Woo reported on Saturday.

Drayer: How Polanco’s departure impacts Seattle Mariners’ offseason

Woo reported a league source said trade discussions between the Mariners and Cardinals have been heating up since the Winter Meetings, and that switch-pitcher Jurrangelo Cijntje and outfielder Lazaro Montes – two of Seattle’s top-seven prospects, per MLB pipeline – are two names St. Louis has inquired about, among others.

The Cardinals will not trade Donovan unless they are “blown away” by the return, and it’s believed they are looking for at least two prospects, per Woo’s reporting.

The San Francisco Giants were the other of the two front-runners Woo named. She also said that both the Mariners and Giants remain engaged in talks with the Arizona Diamondbacks about second baseman Ketel Marte.

Can the M’s give up what Arizona wants for a Ketel Marte trade?

Donovan, who will turn 29 next month, has two years of club control remaining. He’s played every position except catcher during his four-year career, with the majority of his time coming at second base and left field. He would figure to mainly factor in at second base and third base for the Mariners, who have young players like Cole Young, Ben Williamson and Colt Emerson vying for time at those positions.

Donovan was a first-time All-Star in 2025, batting .287 with a .353 on-base percentage, .422 slugging percentage, .775 OPS, 32 doubles, 10 home runs and 50 RBIs in 118 games. His 13% strikeout rate ranked in the 92nd percentile of big league hitters and his 13.4% whiff rate in the 95th percentile, per Baseball Savant.

Over four MLB seasons, Donovan has a career .282 average with a .361 on-base percentage, .411 slugging percentage, .772 OPS, 97 doubles, 40 homers and 202 RBIs in 492 games. He won the NL Gold Glove for utility players during his rookie season in 2022.

As for the prospects Woo reported the Cardinals inquiring about, the 22-year-old Cijntje is Seattle’s No. 7 prospect, per MLB Pipeline. The unique pitcher had a 3.99 ERA and 1.22 WHIP while holding opponents to a .207 average, striking out 120 batters and walking 51 in 108 1/3 innings pitched over 26 appearances (23 starts) across High-A and Double-A in 2025.

The 21-year-old Montes is considered to be the best power-hitting prospect in the Mariners’ farm system and is their No. 3 overall farmhand, per MLB Pipeline. The slugging outfielder hit .241 with a .354 on-base percentage, .504 slugging percentage, .858 OPS, 19 doubles, seven triples, 32 home runs, 89 RBIs, 83 walks and 169 strikeouts over 131 games across High-A and Double-A this year. Montes finished tied for third in home runs among minor leaguers across all levels.

The report that the M’s are one of the top contenders for Donovan came on the same day as they lost out on re-signing their top remaining free-agent target, second baseman/designated hitter Jorge Polanco, who reportedly agreed to a two-year, $40 million deal with the New York Mets.

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The Seattle Mariners’ offseason will not be completed in a nice, neat, run-it-back bow, with reports Saturday morning that Jorge Polanco and the Mets are in agreement on a two-year, $40 million contract.

Drayer: Mariners’ plan for 2B and 3B coming more into focus

The number was stunning, with most industry insiders estimating Polanco would be looking at something closer to $12-15 million per year. Even ESPN’s Jeff Passan, one of the few to estimate Polanco would receive above $15 million per year, was likely to be surprised Saturday morning.

“He’s not getting $20 million a year,” Passan told Seattle Sports’ Brock and Salk on Tuesday. “I think at the end of the day, it’s probably going to be $14-17 million a year. If there are two teams duking it out at the end, maybe it goes up a million a year. It looks like it is going to be a three-year deal, but something along the lines of three (years) for $45-50 (million). I think that’s about right.”

The one move Passan says could make Mariners the AL favorites

The estimated $17 million salary sounded outrageous to the show hosts, but a lot can change this time of year, namely the Mets losing Pete Alonso to the Orioles. In comparison, Polanco is not exactly a splash after the loss of Alonso, but his versatility and offense when healthy (an .821 OPS in 2025) were attractive to the Mets.

Polanco going elsewhere was certainly a possibility – perhaps established as a good possibility when he failed to sign quickly, unlike the Mariners’ No. 1 target of the offseason, Josh Naylor. They were well aware of this with president of baseball operations Jerry Dipoto recently admitting the odds were technically against them with numerous teams involved. The Mariners valued Polanco but were outbid by a team that needed to make a move. So they must move on.

While the Mariners remained engaged in talks with free agents this week, it is the trade market where the most attractive candidates reside, with the Cardinals expected to trade Brendan Donovan and the Diamondbacks making Ketel Marte available.

Donovan and Marte would be great fits on the field and on the salary spreadsheet for Seattle, but they would come at the cost of prospect capital with the Cardinals, and to a lesser extent Diamondbacks, dealing from a position of leverage.

The Cardinals do not have to deal Donovan, who has two years remaining under club control, but his value presents new president of baseball operations Chaim Bloom the opportunity to make a significant early organizational mark.

In the case of Marte, the leverage he brings the Diamondbacks is short-lived as he will become a 10-and-5 player in the first weeks of the season, meaning he will be able to veto any trades at that point.

Can the M’s give up what Arizona wants for a Ketel Marte trade?

On the free agent market, despite reports that agent Scott Boras reached out to the Mariners about third baseman Alex Bregman having some interest in the team, the big-ticket players appear to remain off limits for the Mariners. They have maintained that the door would be open for Eugenio Suárez in the right circumstances. Assuming that would be a one-year deal, that signing seems unlikely to happen. The remaining free agent infielders appear to be more stopgap options of the take-a-chance variety with names like Willi Castro, Luis Rengifo or even Adam Frazier available.

The loss of Polanco and his production at the plate put Dipoto and general manager Justin Hollander in the position where they are going to have to make a gamble. They have a track record of making trades that end up requiring lower-ranked prospects than expected. If that is not the norm this winter, then do they make that painful prospect trade, or trade a starter from the big league roster? Does ownership decide it can make a gamble in expanding the budget for a higher-priced free agent, or does it take the gamble of making smaller moves, essentially staying where they are, seeing how it plays out and attempting to make big moves at the trade deadline once again?

The Mariners and Mariners fans have just been hit with a large dose of uncertainty. In the uncertainty are opportunities, however, and the remainder of the offseason should not be quiet.

More Seattle Mariners offseason coverage

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• Why Nolan Arenado could make sense as a Seattle Mariners trade target
• Seattle Mariners pick two, lose one in minor league phase of Rule 5 draft
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Follow @shannondrayer