We're FFP compliant. You're conflating FFP and SCR which is more problematic. It just means wages have to come down whilst we are in Europe. There is no pressure to sell in monetary terms, but we need to find a way of either maximising revenue further still, which will be difficult given we have Europa but no CL football, but doesn't mean a sure fire sell is the only answer.
As it is we are stacked in midfield so it is possible that one of our midfielders does go. It might be Ramsey just for that pure profit and of course the money he brings in, but there's plenty of others that could go before a Ramsey: Buendia, Dendoncker, Bailey are the three obvious candidates, maybe even Barrenechea who spent the season on loan at Valencia and broke into the Argentina squad.
But again, we'll be looking at those on the heaviest wages first. That's likely to be the likes of Martinez, Rogers, Digne, Kamara, Watkins, Tielemans way before we get anywhere near McGinn. As it is of those only one would go if that's the route they choose to go down. McGinn only goes if he wants to. And given that's he's the club captain, has said how happy he is at Villa, given the rapport he has with the fans, how happy Emery is with him, it seems a bit of an odd link.