A Winnetka man has been charged with two sexual offenses involving a minor.

Alan G. Rottman, 48, of the 200 block of Scott Avenue, was arrested by Wilmette police July 28 and charged with criminal sexual assault and criminal sexual abuse of a juvenile.

Authorities were notified that a “female juvenile was abused by her mother’s boyfriend in August of 2008,” according to a police statement. “The abuse occurred at the victim’s mother’s home in Wilmette,” it said.

Due to the age of the victim, no further information would be released, Wilmette Police Cmdr. Patrick Collins said in an email. The age of the victim was not released.

Rottman was released Aug. 1 on a $100,000 bond and was given an Aug. 24 court date in Skokie. He could not be reached for comment.