I wonder if Chelsea would be stupid enough to give us one of those two for Garnacho...? Although they've been stupid enough to stack that right side of too many players that don't want to warm the bench, in Palmer, Neto, Madueke, and the two kids you mentioned, so who knows? They're lucky that Palmer is even better as a #10, which solves a lot of the minute issues for this season.
I'm not even sure which players Chelsea apparently wanted to offer us in exchange for Garnacho.
The ones that would really interest us have considerably higher market values than the Argentine: Palmer, Caicedo
The ones who we could realistically swap are both injury prone and first team regulars for them: Lavia, Neto
The rest of their players who are worth looking at aren't worth 60m and they probably wouldn't even offer some of them: Colwill (they probably wouldn't swap and doubtful that we need him as he's more of a CCB), Adarabioyo (not a high value player), Anselmino (a kid with good potential), Acheampong (a kid with immense potential), Chukwuemeka (a kid with good potential)
These are the only players that United should be interested in IMO, but I can't see a straight swap for any of them with Garnacho.