Arsenal  defender Laurent Koscielny  says he may be forced to leave the Premier League outfit if the Gunners do not start winning silverware soon.Arsene Wenger 's side last won a trophy over eight years ago - the FA Cup in 2005 - a spell that has seen the club sell a string of top players like Cesc Fabregas, Samir Nasri and Robin van Persie, often to league rivals.Now the 27-year-old, who has been linked with a move to Bayern Munich, hopes the north London outfit are ready to prove their ambition in the league next season, otherwise he will look for a new challenge elsewhere."I feel good at Arsenal, if we have ambition to fight against the other teams of course I want to stay here," Koscielny told Eurosport."It's hard psychologically. We are constantly pressured because if Arsenal is not in the Champions League it would be a catastrophe."I have to see if I have clubs interested in me. I will not go to any club. I want to may be discover another league. Paris [Saint-Germain]? There has been no contact yet."It is hard to not win titles year after year. We are competitors, professionals, we want to win. I want to add to my list of achievements. If Arsenal cannot allow me that, I'll seek a move elsewhere."