On January 13, 2011, TSV 1860 München announced that Cooper would not fulfil his contract which had been set to run until June 2012 and would be joining Portland Timbers on a free transfer.
2011. január 13-án a TSV 1860 München bejelentette, hogy Cooper nem fogja kitölteni a szerződést, amely 2012-ig szól, mert csatlakozik a Portland Timbers csapatához, ingyen.