“He is uncomfortable to play against," Mustafi told Arsenal Player.
“He's someone you can play well with. He doesn't just run around and wait for someone to give him a pass to score a goal. He works a lot for the team as well and he creates chances.
“He's in the right place at the right time, as he showed last year in La Liga. I played there for two years and I know it's not that easy to score many goals in La Liga, because you have great defenders there as well.
“I think he's going to help the team a lot."