Chicago's police watchdog agency recommended Michael Mette be suspended without pay for 90 days.
He claimed self defense in a fight with a drunken college student in Dubuque, Iowa.
Mette served 11 months in prison before his conviction was overturned in 2008.
Chicago's Independent Police Review Authority is recommending a suspension saying he lied to police in Iowa about the fight.
The Chicago Tribune reports Superintendent Jody Weis is expected to challenge the suspension.