BOCA RATON, Fla. — To further exemplify Brian Cashman’s mantra that he is open to talking about any player on his roster, the Yankees have discussed Brett Gardner with the Mariners, The Post has learned.

No trade discussions were characterized as far along or specifically targeted to just one team. Nevertheless, Gardner has long been a player whom new Seattle general manager Jerry Dipoto has liked going back to his time as an executive with the Diamondbacks and Angels. The Mariners, in fact, as part of the six-player trade done last week with Tampa, obtained center field prospect Boog Powell, who is commonly compared to Gardner in projecting his future.

Powell, though, is not expected to be ready to open the 2016 season and the Mariners are in win-now mode. They have identified as a priority adding on-base skills in front of a lineup middle of Robinson Cano, Nelson Cruz and Kyle Seager. Only two of the 11 Mariners who came to the plate at least 200 times last year had a better on-base percentage than Gardner’s .343.

The Yankees are particularly looking for high-end starting pitching that they control for seven years because all of their current starters, except Luis Severino and Adam Warren, can be free agents after either the 2016 or 2017 campaign. The Mariners essentially will not talk about Taijuan Walker. But The Post has learned they would discuss 27-year-old lefty James Paxton, whose delivery has reminded folks of Andy Pettitte. Paxton was among the pitchers the Yankees were looking at more intensely late in the season and now in the Arizona Fall League under the belief they could become available in the offseason.

Paxton missed four months in 2015 with a strained middle finger on his pitching hand, and has health concerns. Nevertheless, he has been effective when pitching in the majors, going 12-8 with a 3.16 ERA in parts of three seasons (30 career starts). He is pitching in the Arizona Fall League, where he was 1-3 with a 4.43 ERA in five starts.

Gardner is known as a Cashman favorite, emerged as a team leader last year after the retirement of Derek Jeter and is one of the few high-end athletes in the Yankees’ everyday lineup. Nevertheless, he is 32 and has three years at $39.5 million left on his contract at a time when Cashman is trying to create payroll flexibility because his budget is being restrained this offseason.