CHICAGO (CBS) — Former Mayor Richard M. Daley has canceled plans for a speech at a small college in Michigan, after citing unspecified “health concerns.”

A spokesman for Calvin College in Grand Rapids, Michigan, said Daley had been scheduled to speak Wednesday as part of the school’s “January Series” lineup, but has since pulled out.

“Unfortunately Mayor Daley is no longer speaking at Calvin on Wednesday, citing health concerns for canceling,” Calvin spokesman Matthew Kucinski.

Detroit venture capitalist Josh Linkner, will speak at the college instead.

Representatives for Daley could not immediately be reached for comment.

Crain’s Chicago Business reported a family friend said Daley’s recovery “isn’t where we’d hoped. He’s not at a point in the recovery where he can do it. He’s great. He’s just not quite ready yet.”

It would have been Daley’s first speaking engagement since suffering stroke-like conditions nearly a year ago.

Details of why Daley was hospitalized last year have remained a secret, but his family has said since then that he’s doing well.

Last July, he was excused from testifying in open court in connection to the Emanuel administration’s effort to break a long-term deal with the operators of the restaurant at Millennium Park, after lawyers for the restaurant reviewed his medical records and agreed not to call him to the witness stand.