I don't know why anyone is surprised Messi is playing. Messi wouldn't pass out such an opportunity to bag several goals. And Koeman doesn't do anything regarding Messi that Messi hasn't sanctioned beforehand.
Something like this:
- Hey, Lionel, would you consider resting in the next game, to be fresher for the more important and tougher Betis match?
- No.
- OK, I was just asking.