The game will be held July 14 at Great American Ball Park, the home of the Reds, and will be televised by FOX.
"It's nice to be thought of in that way," McClendon said. "I told Ned just that. I'm very appreciative of the fact he thought of me to have me as one of his coaches. It's pretty neat."
McClendon was selected, along with A.J. Hinch of the Astros, as the managers who'll be part of the AL coaching staff, which will include Yost's coaching crew with the Royals.
It will be McClendon's second All-Star experience, as he was on Dusty Baker's National League staff at the 2003 game in Chicago when he was manager of the Pirates.
"It's a lot of fun," said McClendon. "Cincinnati is where I started my big league career and it'll be fun to go back and visit with some folks."
National League skipper Bruce Bochy of the Giants selected Don Mattingly of the Dodgers and Bryan Price of the Reds for his coaching staff.
Though McClendon's team has struggled to a 24-29 start this season, going into Thursday's series opener with the Rays, he led the Mariners to an 87-75 record in 2014 in his first year, a 16-win improvement for a team that wound up one win shy of an AL Wild Card berth.
Now he'd like to see his Mariners get on track in the remaining five weeks before the Midsummer Classic and be able to bring a number of his players along with him to the festivities.
"I hope to," McClendon said. "That would mean we're performing well."
On Tuesday, July 14, watch the 2015 All-Star Game live on FOX, and during the game visit MLB.com to submit your choice for the Ted Williams Most Valuable Player Award presented by Chevrolet via the 2015 MLB All-Star Game MVP Vote.
MLB.com will provide extensive online coverage of All-Star Week festivities.
The 86th All-Star Game will be televised nationally by FOX, in Canada by Rogers Sportsnet and RDS, and worldwide by partners in more than 200 countries via MLB International's independent feed. ESPN Radio and ESPN Radio Deportes will provide national radio coverage of the All-Star Game. MLB Network and SiriusXM will also provide comprehensive All-Star Week coverage. For more information, please visit allstargame.com.