Before we sell anyone we need to assess whether or not the amount offered can buy us a better player who fits our needs and team well. To buy an in form central midfielder with the skills and energy of an in form John McGinn would cost at least £40 million, probably more. Then consider his age (26 I think) and to find someone available becomes even harder. Finally think about their standing and relationship to the rest of the squad. McGinn is an established first team player, who is immensely popular within the squad, who knows how everyone plays and they know how he plays. At his best he is worth much more than £50 million (in today's ridiculous prices for footballers) and although he has not played as well as he can do this season, you must remember that he has played in a deeper holding role for much of the season to accommodate Ross Barkley. When allowed to play further forward, either for us or for Scotland, he has looked much better. Last season it took him a while to recover from his injury too. When Douglas Luiz and Nakamba were with him in a midfield three towards the end of the season he was tearing it up, hustling opposition players, making them panic and generally looking back to his best. This was well demonstrated against Tottenham, Champion's League finalists last year, and he was immense in that more attacking, box to box role.
IF, and it's a big if, we sold him then the odds of getting an equally good player, who offers the same qualities, is a similar or younger age, is in good form AND is available for the same money or less are very, VERY small. Then you have to hope he settles quickly, gets on well with the squad and continues his good form for us. There is virtually no chance of that all happening when you are talking about a quality international player like John McGinn.
Of course every other club is interested in him. They'd be fools not to be, but top clubs don't sell top players unless that player wants to go, and I am pretty certain that he has no desire to go anywhere. Big players who don't ask to go usually only change clubs at the end of their contracts (Aguero for example) as their value to their club is simply more than anyone can afford. We do not NEED to sell, do not WANT to sell and other clubs are not going to offer the sort of money that would be needed to persuade us. Not bad for a player we got from a club that did NEED the what, £2.5 million we paid for him?
By the way, I think all of the above could equally be true of Grealish, Watkins, Konsa or any of our other top players that others seem to think we will lose this Summer. We need to buy players that can fit into the squad and allow our best players to play in their best positions. That is why I am so keen for us to buy a top defensive midfielder, to allow McGinn to play further forward, ideally in a 4-3-3 formation as a box to box midfielder or in a 4-2-3-1 formation, in front of the holding players and between Grealish and Buendia.