I say buy, even for 20m. Our squad is wafer thin and this is a guy who has played and scored for us regularly, albeit in a lower league. I would prefer a loan to buy though.
He’s a good lad but he’s a painfully average player. If you’re a wingback in modern football and are useless in the final third then you have no place being in the premier league.
I don’t even want him as a backup.