By that record, we should not peruse Mbappé if he shows up on the shop window? Dembele would be in the top three youngsters in world football along with Mbappé and Jesus, so there's risk - like every other transfer - but very little.
He was so good at Dortmund, amazing at Rennes, got a few bad injuries days into his time at Barcelona where a coach plays a 4-4-2. When played, he’s done well but doesn't fit the system Valverde plays. And many question whether he should still be there next season as it's ”not the Barcelona way” .