Jens Lehmann has admitted the Arsenal icon is ‘very disappointed’ with Mikel Arteta for the manager’s decision that is stopping the Gunners from being a ‘big club’ again. The German enjoyed a heroic career in north London under Arsene Wenger and knew what it took to win. Lehmann lifted the Premier League title in 2003/04 as an Invincible, won the FA Cup in 2004/05 and also helped Arsenal to reach the Champions League final in 2005/06. It remains the only time that Arsenal have ever reached the Champions League final in their storied history as a club. Arteta is even fighting to see Arsenal win…