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I feel like if he does leave, it would not be for cheap and if they can sell him for a lot of money then they could end up with a good amount of money that can be used to get more players. Inter is not doing well financially even after a UCL finals and not buying players that would be great, they haven't spent all that much money even though they have earned so much money.
This is why I believe that the best thing to do for them would be selling Martinez and then using that money to get new players. Better yet, they should be using all the money they have made from UCL into the team already and not doing that right now, I feel like they should and that could be the most important thing that would be very good in the end.
Indeed, selling Martinez at a high price is a pretty good idea if the goal is to have more money or improve the club's finances. And also so that Inter Milan can buy more of the players they need to prepare for a more fierce competition in the coming season. But what Inter Milan is afraid of is that they are afraid of not being able to buy players who are on the same level as Martinez. And this can have a negative impact on the team's performance in the coming season. Because having a lot of money cannot be a guarantee that you can buy a better player than Martinez.