"I can't say where I will play next season," he told the Fulham Chronicle.
"But I like to play in the Premier League, and here it's a great club and we have great fans. I'm proud to be here."
However, the 29-year-old knows it all depends whether Cottagers boss Martin Jol can strike a deal with the Bundesliga outfit.
"It will be the decision of the club and Cologne. They will speak together and in the end they will speak to me," he added.