SEATTLE -- The Mariners are expected to formally announce their 2025 coaching staff in the coming days, potentially as soon as Tuesday, and Edgar Martinez will indeed return but in a broader role, specifically overseeing the club’s overall hitting program, sources familiar with the situation told MLB.com on Thursday night.

Additionally, the Mariners will name Kevin Seitzer as their hitting coach, who will report to Martinez, and Bobby Magallanes as assistant hitting coach, sources said.

Seitzer spent the 2015-24 seasons in the same role with the Braves, overseeing one of MLB’s best offenses during his time there, which included seven playoff appearances and the 2021 World Series title. Magallanes was Seitzer’s assistant hitting coach in Atlanta, from '21-24.

Separately, Carson Vitale -- the Mariners’ Major League field coordinator since the 2020 season -- is leaving the organization to join new Marlins manager Clayton McCullough as bench coach in Miami.

Seitzer, 62, played 12 seasons in the Majors (1986-97) then was the hitting coach for the D-backs (2007), Royals (2009-12) and Blue Jays (2014) before being hired by the Braves. He was an integral figure in Atlanta’s rebuild at the time of his hire and remained a key figure during the club’s sustained run of winning, which included six straight National League East titles and an NL Wild Card berth last year.

Seitzer was influential in the development of Braves homegrown products such as Ronald Acuña Jr., Ozzie Albies and Dansby Swanson. He also helped Matt Olson and Marcell Ozuna produce the finest seasons of their respective careers.

Magallanes was there alongside him since 2021, but neither was retained after last season despite each having one year remaining on their respective contracts. His job in Atlanta was his first in MLB.

Martinez spent the final 34 games as the Mariners’ hitting coach last season -- with positive results -- under new manager Dan Wilson after Scott Servais was relieved of his duties. Martinez will spearhead the implementation of general hitting philosophies and coaching practices, and he will be a regular presence for home games and in Spring Training but isn’t expected to regularly travel.

That itself was expected as Seattle wrapped the 2024 season, when Martinez expressed an interest in returning in some capacity -- along with just about everyone within the organization -- but in a less demanding role. Before being brought on in the interim role on Aug. 22, Martinez served as the Mariners’ hitting coach from midway through the 2015 season through the end of ‘18.

The coaching transition, specifically on the hitting side, has been significant over the past 12 months. Last November, the Mariners hired Brant Brown to a newly created position as offensive coordinator and Tommy Joseph as assistant hitting coach, supplementing director of hitting strategy Jarret DeHart.

All three have since left the organization, with Brown let go in May despite being just months into the job and DeHart dismissed with Servais in late August. Joseph left for the same role with the Orioles earlier this month.

The turnover has been a byproduct of a lack of offensive consistency. The Mariners finished 85-77 last year and, excluding tiebreakers, one game back of the final American League Wild Card spot, as the first team on the outside looking in on the postseason standings. Yet they operated with arguably the AL’s best starting rotation, one seemingly built for October yet handcuffed by its offense.

Before Martinez took over, Seattle ranked 28th in OPS (.666), 27th in runs per game (3.93) and 30th in strikeout rate (27.7%). After, they ranked fourth in OPS (.764), fourth in runs per game (5.09) and 15th in strikeout rate (23.7%).

The Mariners are bullish on bridging the successes under Martinez with the experience from Seitzer and Magallanes to solve their offensive riddle.