nico probably, but if i'm wrong and sancho is in the bag too, then he can also play on the left. osman said the other day that he's a natural. i only saw him on the right so can't comment
He is equally natural at both flanks. He is just one of those all around complete wingers, not bound by which side. He is more of a scoring threat as LW and more creator as RW, but for either he is mainly a patient high level dribbler who playmakes with ease.
If you check this clip, his half season in Dortmund, it's basically like 65-35 split in favour of the left for which flanks most of his action was from:
Since he is so good at both, he is a player who gets moved to the flank he is needed at. And since we just signed two pure right wingers who are very left footed. It goes without saying any interest in us getting Sancho is strictly about using him as LW.