Arsenal have now made an offer to sign a Real Madrid player who played for Carlo Ancelotti 31 times this season in their double-winning campaign. In the midst of the recent Benjamin Sesko chase, it’s been easy to feel like Arsenal’s whole summer revolves around signing a striker – but that’s simply not the case. Mikel Arteta needs to improve squad depth in several areas, and perhaps won’t be able to concentrate all of his funds on a centre-forward. Arsenal need a centre-back to provide better cover for William Saliba. Adding a starting left-back will also be crucial, someone who can combine th…