Nils Arne Eggen, the most successful coach in the history of the Norwegian league, has returned to the Rosenborg BK helm as Erik Hamrén leaves to take up a full-time post with Sweden's national side.

The 68-year-old Eggen has committed to coach the Trondheim team until the end of the 2010 season. Hamrén had planned to stay with Rosenborg until 1 August, but the club preferred to release him early. The 52-year-old, whose work with Sweden started last November, will lead the national side full time from 1 June.

A former Rosenborg defender, Eggen was in charge for all but one of the campaigns between 1992 and 2004 when Rosenborg won 13 straight Norwegian titles. "I am not a caretaker coach," he said. "Who am I holding the fort for?" Rosenborg are second in the Premier Division, three points behind Tromsø IL after 12 matches.