This is a player who never had any major injuries before he joined barcelona, so there is probably an issue with how barcelona train their players that is different to how Dembele trained with his other clubs, They are all muscular injuries so with the proper training regime and in this age of sports science that we live in, it really should sort itself out.
If we get a fully fit Dembele, he will be the most devastating attacker on the team, you want to talk about dribbling, he is already one of the best dribblers in world football, he has explosive pace, he is as two footed as Mason Greenwood. He is a one man counter attack and you will be putting him in a team where he already has two friends, settling in will not be a problem for him.
I always wished we signed him all the way back when he was at Rennes and could not understand why we did not go for him then and let him join Dortmund so easily because even then I was of the opinion that he was already better than what we had in the wide positions.
For all those worried about his attitude, its been reported that Sancho also has a sketchy attitude as well, would that stop you from getting him.
If this is only a loan with an option to buy, then I don't see the problem. I'll take a player that is world class so long as we can manage him properly, I bet when he starts doing more high intensity training, the muscular injuries will be a thing of the past, Like I said they are muscular injuries, not impact injuries for all those that think that the premier league being harder means he will get injured more, I'd even go as far as to say that he suits the premier league a lot more than he suits La Liga because his game is based on explosiveness and pace but it also helps that he has excellent technical abilities.
I include these two links because they might be true of not but, I'd rather believe it anyway, I'm ever the optimist
https://metro.co.uk/2020/04/19/ousmane-dembele-anthony-martial-manchester-united-transfer-man-utd-12579378/#:~:text=Martial is international team-mates with Dembele and has,attacker might have told his compatriot is unknown.
https://www.thesun.co.uk/sport/football/11431212/barcelona-utd-transfer-martial-dembele/