Grand Chute Community Resource Officer Travis Waas said the 'roo was reported heading east from Fox Cities Stadium.
"Officers wandered the bush and thicket looking for signs of the joey, but were unsuccessful. It would appear that the kangaroo had... Wait for it. Hopped along," police tweeted.
Waas said police will consult with local zoos in an attempt to identify the animal's owner if it turns up again.