Less than two months after leading his team to a state championship, Dominican High School boys basketball coach Paul Wollersheim has been arrested on suspicion of sexual assault.

No criminal charges have been filed against Wollersheim, however, FOX6 News reports that the school has placed him on administrative leave as the investigation continues. Prosecutors are considering felony charges, the TV station says.

Colleen Brady, the head of the high school, told FOX6 News that Wollersheim and another employee were in the school just after 1 a.m. on Friday. The employee reportedly went to the police less than an hour later, accusing Wollersheim, who is also the school's athletic director, of making inappropriate contact.

Brady said school officials are cooperating with the Whitefish Bay Police Department in the investigation.

Brady told WISN-TV that the alleged victim is a female teacher.

"We were just absolutely stunned. We had no idea, no clue that some incident had occurred," Brady told the station.

Brady said Wollersheim, 49, has keys to the building, but said there was no reason for anyone to be at the school especially at that time, according to WISN.

Wollersheim, who has been with the school for 17 years, led the Knights to a Division 4 WIAA state championship in March. The Knights finished the season with a 27-1 record and were 16-0 in their conference last season.