I think they're extremely cautious and don't want to rush him which I'm fine with. This month we're playing against Bayern (a game he's nowhere near ready to play in), Granada, Cadiz, Levante and Benfica followed by AM away before another international break.
MD speculates he could get some minutes against either Cadiz or Levante. I'd be ok with this, depending on the result maybe also play him vs Benfica, then keep him out of the Atleti game (knowing how physical they play) and give him two more weeks to return in mid October.