Borussia Dortmund defender Neven Subotic says they were pleased seeing Arsenal sell Cesc Fabregas to Barcelona.
Subotic says Arsene Wenger has a "big problem" at Arsenal after selling Cesc and Samir Nasri.
Defender Subotic said: "Arsenal have changed a lot but players like Fabregas and Nasri are very difficult to replace and it's a big problem for the coach.
"Arsenal are still dangerous. They are an explosive, fast team. We must stop them playing in dangerous areas and work hard to stop them getting the ball.
"They will come to play football but that will suit us. We play better against teams who attack and not just look to defend."
