Tim Hyers, who piloted a successful offensive unit for the past four seasons, informed the Red Sox that he won’t return as the club’s hitting coach in 2022 and will instead pursue other opportunities outside the organization.

A source told MLB.com that Pete Fatse, Boston’s assistant hitting coach the past two seasons, will be elevated to the lead role vacated by Hyers. In fact, Fatse was poised to become the team’s co-hitting coach if Hyers had stayed.

The Red Sox have not announced the moves, but they are expected to do so once the entire staff is in place.

In the first year of Hyers leading their offense, the Red Sox won the World Series in 2018. The club again had a high-level attack in ’19 and ’20.

In 2021, the Red Sox finished third in the Majors in OPS (.777) and fifth in runs (829) but were also prone to bouts of inconsistency on offense, particularly down the stretch. Boston also struggled with situational hitting for large chunks of the regular season.

The most difficult team-wide slump came right after the team’s historic six-game hot streak that took place from Game 2 of the American League Division Series against the Rays through Game 3 of the AL Championship Series versus the Astros. After a Xander Bogaerts two-run homer in the first inning of Game 4 of the ALCS, the Red Sox scored just one run over the final 26 innings of the series, losing all three games and getting eliminated two wins shy of the World Series.

The Red Sox announced last month that Tom Goodwin, the team’s first-base coach/outfield instructor since 2018, was not offered a position with the team for next season.

The rest of the coaches from manager Alex Cora’s staff, which includes bench coach Will Venable, pitching coach Dave Bush, bullpen coach Kevin Walker, third-base coach/infield instructor Carlos Febles, game-planning coordinator Jason Varitek and quality control coach/interpreter Ramon Vázquez, are expected to return.

Fatse already has a strong relationship with many of the team’s hitters, most of whom are under contract or club control for 2022.

A local product from Western Massachusetts, Fatse founded a hitting academy in Palmer, Mass., from 2010-19, where his clients ranged from youths to professionals.

The Twins hired him as their Minor League hitting coordinator in 2019.