 He sufficiently impressed Derby for his loan to be extended for a further two months.Stoor returned to Norway in January 2011, when he signed for Vålerenga as a free agent.After playing 15 matches for Vålerenga in Tippeligaen, Stoor was wanted by his old club Rosenborg ahead of the 2012 season, but he did not pass the medical test in Trondheim.