Dick Biondi

Two high-profile hosts at WLS FM 94.7 — evening legend Dick Biondi and morning personality Jack Diamond — are missing in action from the Cumulus Media classic hits station.

Both have been off the air for weeks due to health issues, according to Jan Jeffries, senior vice president of corporate programming for Cumulus Media and program director of WLS FM. No word on when either will return.

Biondi, 82, whose last appearance on the station was during his annual toy drive marathon broadcast December 13, was sidelined with the flu when he injured himself in a fall at home. “We love him and we’re just anxious for him to get back,” Jeffries said. “He loves this station and he loves this business. We need him.”

Filling in for the Radio Hall of Famer from 11 p.m. to 2 a.m. weekdays has been WLS veteran Jeff Davis, who broadcasts from studios in Los Angeles.

Jack Diamond

It’s less clear whether the station expects Diamond back on the morning show, which he began hosting in November. His last broadcast was December 24. As of this week, Diamond is no longer being mentioned on the show and his name no longer appears in on-air promos.

Back home in Washington, D.C., Diamond, 60, said he will be undergoing surgery for diverticulitis, which he called “a very painful and debilitating condition.” On Saturday he told Facebook followers: “I hope to return to Chicago absolutely as soon as possible. I thank the wonderful staff there for being supportive, professional and kind. This is not the way I wanted to start 2015 . . . but I am so lucky to have family and friends close at hand.”

Co-host Brant Miller is back to hosting solo from 5:30 to 9 a.m. weekdays on WLS FM.