Tollefsen agreed to a rookie deal with BC Kalev of the VTB United league in Tallin, Estonia, it was reported by Eurobasket.com on Saturday.
The forward from Danville, California played one season at Arizona, arriving as a graduate transfer after playing three seasons with the San Francisco Dons.
With the Wildcats, Tollefsen averaged 7.0 points and 3.0 rebounds per game and shot 51.4 percent from the field and 36.5 percent from 3-point land.
In three seasons with the Dons, Tollefsen averaged 10.6 points and 4.1 rebounds per game, including scoring 14.