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Things don't go well when there are several players playing the same position on the same team. Competition should increase quality, but it negatively impacts player motivation, so I don't like star players playing together.
Any player who doesn't contribute to the team can leave; at least they'll contribute financially. With this budget, the team could acquire several more valuable players
That's why some teams sometimes prefer to bring in young players rather than star players who play in the same positions as their existing star players. These young players can be long-term projects, they usually don't complain much when they're benched, but star players are different. Star players expect enough playing time, they want to prove their quality rather than just sitting quietly on the bench.
Many star players choose to leave when their team acquires a new player of equal or greater quality. A reduction in playing time is a consequence for these players if they stay, but if they're a club icon, that shouldn't be a problem.
While am not against bringing young players to a team you should know that every club is thinking about winning a trophy and you can't win any major trophy with young inexperienced players young players should only come in to complement the efforts of the older once who are in their prime playing, I don't personally blame the older players for complaining when they are left out in the bench because as a player when you are left out of the main team your value reduces which will affects your rating in the market