SEATTLE — In an attempt to resurrect a season and bats that have flatlined, the Yankees reached into Aaron Boone’s past for a better shot in their immediate future.

A day after dismissing Dillon Lawson in the middle of his second season as hitting coach, the Yankees hired Sean Casey for the role.

The likelihood is the deal is for the rest of the season so the organization can gauge his abilities, and the 49-year-old Casey can decide whether this is something he would like to do into the future.

Casey has strong ties to both Boone, whom he played alongside with the Reds from 1998-2003, and Yankees vice president of baseball operations Tim Naehring, who was then Reds’ director of player development.

“I’m just really excited about having this opportunity in the second half to impact the guys in the lineup,” Casey said in a statement Monday. “The Yankees have a lot of professional hitters, and I’m looking forward to connecting with them and getting on the same page.”

Assistant hitting coaches Brad Wilkerson and Casey Dykes will be retained, and Casey said he “can’t wait to utilize their skills.”

Casey’s hiring is an extreme departure from Lawson, who never played in the majors and relied strongly on analytical elements revolving around exit velocity and pulling the ball in the air.

Casey was a lefty, use-the-whole-field hitter who batted .302 over 12 major league seasons, in which he made three All-Star games. Known as “The Mayor” for his gregarious nature, Casey has never coached for a major league team. He has been working at MLB Network for the past 15 years.

Now he will be tasked with fixing a veteran Yankees offense that has underperformed and particularly tanked since Aaron Judge went down. A Yankees offense that features the likes of Giancarlo Stanton, DJ LeMahieu, Anthony Rizzo and Gleyber Torres had the 10th-worst OPS in baseball (.710) over the first half.

“As far as our hitters go, I think every guy is different,” Casey said in the first hint of his offensive approach. “There’s no way to cookie cut hitters, and if you start doing that, you get into trouble and underutilize strengths they may have. I’m going to get to know each player and their approach at the plate.

“One thing I will stress is controlling the zone and hunting in the zone. I want them to control their process and stick to their approach with the goal of winning every pitch. At the end of the day, we’re going to focus on making sure each hitter has a process that brings out the best version of himself.”

Casey is expected to bring an upbeat nature, a different philosophy and the heft of having produced as a major leaguer.

Boone, who said he has known Casey for nearly 30 years, said his passion for hitting is “contagious.”

“For anyone that’s ever come in contact with him, his ability to inspire is one of his greatest gifts, and I can’t wait for him to tap into our players and help them reach their potential,” Boone said. “There’s no doubt in my mind that he will have a tremendous impact on our team.”

Lawson often summarized his philosophy as “Hit strikes hard.” He valued process over results, believing strong at-bats and hard-hit balls would turn into hits.

The Yankees have struggled offensively this season. The team has a collective .230 batting average and .300 on-base percentage — both second-worst in the majors — and it all has been worse since Judge injured his right big toe June 3 against the Dodgers.

Stanton (.702 OPS) has been a shell of himself. LeMahieu (.643 OPS) has plunged and struck out more than ever. Rizzo (.753 OPS) has not homered since May 20. Anthony Volpe (.682 OPS) has begun to come around but has swung and missed too often.

“I’ve been in professional baseball for almost 30 years, and my passion is hitting and the mental side of the game,” Casey said. “Working at MLB Network for the last 15 years, I’ve been able to keep my finger on the pulse of the game. … So I feel good about being ready for this opportunity to teach and impart my experience and ideas.”