- Shkodran Mustafi (€41m)
The German international was one of the biggest stories of the recent summer window. Injuries to Per Mertesacker and Gabriel saw Wenger plunge into the market for additions to his defense and after a lot of delays, the manager finally decided to spend the big money on him. The 24-year old has been excellent in La Liga over the last few years and has already impressed in the 4 outings he has got so far this season. He has now established a top class partnership at the back for the Gunners alongside Laurent Koscielny.