Peter van de Graaff

Peter van de Graaff, chief announcer at WFMT FM 98.7, is filling in as morning personality at the classical music station for the foreseeable future while Carl Grapentine recuperates from quadriceps tendon surgery on both legs.

Van de Graaff, who doubles as host of the Beethoven Satellite Network overnight music service, is now being heard nine hours a day — on his “Through the Night” program from midnight to 6 a.m. and filling in for Grapentine from 6 to 9 a.m. Monday through Friday.

Carl Grapentine

Midday host Lisa Flynn, who’s normally on from 10 a.m. to 1 p.m., is starting her show an hour earlier at 9 a.m. while Grapentine is out.

Since his surgery November 17, Grapentine has been in ankle-to-thigh casts on both legs. It’ll be another six weeks before the casts are removed and he can begin rehab, according to a post on his Facebook page.

No word on when he will return to WFMT.

“Carl is recuperating nicely, is in good spirits, and wants to thank everyone for their good wishes,” a spokeswoman for the Window to the World Communications station said Monday.

Except for a six-year stint at the former WNIB, Grapentine has hosted mornings on WFMT since 1986. The Michigan native doubles as stadium voice for the University of Michigan Wolverines. Last Saturday was the first Michigan-Ohio State game he’d missed since 1968.

In the latest Nielsen Audio survey, WFMT tied for 29th in mornings with a 1.1 percent share and cumulative weekly audience of 134,600.