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You are right to worry about Tottenham big squad even though new signings like Mohammed Kudus and Morgan Gibbs-White (if that deal happens) are exciting and show team wants to win. With Maddison and Son and Kulusevski and Manor Solomon already there adding more attackers makes team very crowded. It is almost certain Tottenham will sell some players as teams can not have too many expensive players in same spots especially with money rules and keeping everyone happy and playing.
Players like Richarlison, Bryan Gil, Manor Solomon, Yves Bissouma and Pierre-Emile Hojbjerg could all leave. Team challenge now is to sell these players for good price without upsetting team balance. Next few weeks of transfer window will be key to see how they handle this.