In January 2007, he played for the U.S. National Junior Team in the 2007 IIHF World Junior Championship. On June 7, 2007, Okposo announced he would be returning to the University of Minnesota for the 2007–08 season. Okposo played the 2007–08 season for the University of Minnesota ice hockey team until December 19, 2007. On that morning Okposo notified his teammates at the university of his decision to leave the team. Soon after, both the Gophers and the New York Islanders announced officially that Okposo decided to leave college after the completion of his current semester and would then begin his professional hockey career.