I think he's on the right for the year, and most of his chances will be poaching at the far post. Nolito is locked down on the left by the look of it. Unless he goes down or is rested of course.
There's no way Nolito "locks down" the left wing. There's no way any of our wingers lock down anything with Guardiola. He didn't go 90 consecutive games without having the same lineup for back to back games at Bayern by having players lock down a spot. They'll all rotate.
Pep also said after Bucharest that Sterling can play left or right, going to the by line or cutting in, which certainly doesn't suggest he's restricted to one side.