"I wanted to fight (for a place at Chelsea), but then Klaus (Allofs, Bremen director of sport) came and told me all about Bremen," he said.
"A lot has changed and I think Werder have improved in a lot of areas and the team has a lot of quality.
"I want to win things and that is why I am here."
He added: "It was okay, I mean I still had some positive experiences, but it certainly did not turn out the way I had imagined.
"One of the best coaches in the world wanted to have me in his team, but then three months later he was gone.
"That is just my bad luck, but such is football."