Would be a dream to see him start against Granada.
I know it's unlikely but one can dream.
With De Jong out, and Arthur still questionable, I really don't think it's as unlikely as you think. I honestly don't think Setien after all the good vibes he's been receiving from the Barca community in his first week, would risk throwing it all away with fielding that famous Raki-Busquets-Vidal midfield, even if/when we'll play a totally different game and actually have a system, so after some time with trained Rakitic and Vidal it might not be the worst midfield ever, but right now in this position and in his first game, and after all the reports how he and his staff love Riqui, I can't imagine he wouldn't do it, if Raki, Busquets and Vidal would be his only other choices. And it helps that it's Granada at home, the kind of game we would expect Puig to start anyway, if he was with the first team permanently, which he seems to be now, at least for the next 6 months with Alena out on loan and having that extra spot (with Suarez out, even two extra spots) on the first team.
But I think Arthur is actually OK to start already too, and that he will, I mean the guy trained for the whole week, basically was magically back to full strength the minute Setien came in.