Potential? You're getting twice as much as you paid in those two years year and a half and he's been injured and only 21 ffs. I could understand a loan but getting rid of him so easily it's a bit weird.
EDIT: There's a rumour his girlfriend is Luis Enrique's daughter so that might be another reason but still, don't get the City's thought on it.
Pep’s line is we don’t want people who don’t want to be here (unless they’re Bernardo silva, thank Christ). They did something similar with Sane a few years ago. You want to go? Fine, but not before you tear a ligament!