I mean the guy is 27 and is coming off the back of 2 very bad injuries so £30m even in todays market seems a bit steep, I don't watch Napoli but has the guy who's come in since he's been out done well so they're looking to cash in?
The money doesn't really matter to me if they think this guy is the right guy then go and get him but the injuries would have to set off a lot of alarm bells as no one fully recovers from an ACL injury but his doesn't sound that serious if he was back playing within 3 months.
You would assume if Utd did go for him their would be a very thorough medical because Utd insure all their players against injury which is why clubs do medicals and if he couldn't pass the medical we wouldn't do the deal.