Transfer or injury? Why is Cazorla not with Arsenal for pre-season?

I really hope that there is a perfectly good reason for the Arsenal and Spain international midfield star not being with his team mates at London Colney this week as Arsene Wenger and his coaching staff begin the preparations for next season with the start of pre-season training.

I would have thought that Santi Cazorla would be one of the first back at the club after the summer break though, as the Spaniard was not involved with Spain at Euro 2016 after missing a lot of last season with injury. He was fit again by the end and he did start our final Premier League game against Aston Villa so as far as we know there is no reason for him not to be training with the rest of the Gunners that are back with the club.

The other Gunners not involved for their national sides this summer like Theo Walcott and Alex Oxlade-Chamberlain are there after all, so I am a bit worried that there is something that Arsenal are not telling us about the little magician. With Granit Xhaka having joined Aaron Ramsey and Mohamed Elneny at Arsenal, could Wenger be planning for life without Cazorla in the central midfield position?

Perhaps Santi has some fitness problem that is preventing him from training but if that is the case why have we not heard about it?

Bob.