He can, but at least very recently, publicly said he definitively wants to play on the left. It doesn’t seem to make sense with Jr there currently, but what do I know, I’m sure they must have a plan.. although with Ancelotti close to the boot, who knows?
edit: to add further, and somewhat public opinion, but Madrid seem to be a squad of superstars, rather than a team, so maybe they’re just buying as much quality as possible, without thought for roles(?)