SAN FRANCISCO -- Dave Righetti and Shawon Dunston, Giants coaches who participated in bookended portions of the club’s greatest successes, were not asked to remain in the organization for the 2021 season.

Their dismissals were part of the 10 percent reduction in the baseball and business operations staffs that the Giants announced last month. The Giants said in a statement at that time that the cutbacks became necessary due to the “unprecedented impact and continued uncertainty of the pandemic on our operations.”

A club official confirmed Monday that Righetti, who spent the previous three seasons as a special assistant to player development, was not invited back. Righetti, 61, declined to comment about the decision.

Righetti’s 18-year stint (2000-17) as San Francisco’s pitching coach was the longest tenure in that role in franchise history.

Dunston expressed sincere gratitude toward the Giants, with whom he spent his entire coaching career (2009-19). Officially, he also was a special assistant to player development this year.

“I have no complaints whatsoever,” said Dunston, 57. “I’m very thankful. I played 18 years, coached 12. That’s not bad -- 30 years; 29 in the big leagues. Maybe it’s time for somebody else to get the opportunity that I got.”

Righetti was the pitching coach and Dunston served as a utility man for the Giants in 2002, when the club lost the World Series to the Angels in seven games. Both were with the Giants when they captured World Series titles in 2010, '12 and '14.

“I wish the Giants the best,” said Dunston, a two-time All-Star shortstop with the Cubs as well as the Giants' 1996 “Willie Mac” Award recipient, emblematic of the team’s most inspirational player. “I have three [World Series] rings, and I thank the players and the organization for that.”

Righetti’s ascent to the big league staff coincided with the club’s move to Oracle Park, then known as Pacific Bell Park. The park’s spacious outfield dimensions demanded that the Giants build and maintain effective pitching staffs to capitalize on their new habitat. Righetti, with assistance from bullpen coach Mark Gardner, supervised staffs that frequently kept the ballclub competitive. Under Righetti, the Giants ranked among the National League’s top five teams in ERA nine times, including a Major League-best 3.36 in 2010 when they won their first World Series since the franchise moved from New York before the 1958 season.

The Giants finished above .500 in Righetti’s first five years as pitching coach. They achieved greater prominence during the following decade with the three Series titles in five years.

A potpourri of pitchers flourished under Righetti, who was nicknamed “Rags.” Right-handers Jason Schmidt and Ryan Vogelsong, once regarded as castoffs, attained All-Star status. Five closers -- Robb Nen, Tim Worrell, Brian Wilson, Sergio Romo and Santiago Casilla -- recorded 38 saves or more in a season. Matt Cain, Tim Lincecum and Madison Bumgarner each exceeded 100 regular-season victories and thrived in the postseason.

“Rags was huge in my career,” said Cain, a three-time All-Star who pitched the only perfect game in Giants history on June 13, 2012, against Houston. “He did such an amazing job of protecting me when I was a youngster, but he also let me learn the hard way on things that needed to be learned in the big leagues. Rags was so great at letting all the guys be themselves, and he would find ways to refine them to reach their potential as ballplayers and men.”