El Guepardo
Rafael Van Der Vaart
would you say this if it were alli or kane?
personally i would like him to stay, we should do what we can to keep this core together
If they were desperate to get out, and didn't want to play for the club, then yes, I would. Why keep players who don't want to play for the team? They are unlikely to be as committed to the cause, may cause squad unrest and their value will deteriorate.
I would hope that Pochettino and his team would chat with the player in question, to see whether any concerns could be diffused to the point that the player wishes to stay.
Otherwise, good luck to the player but also, goodbye. There are plenty of players who would love to play for the club. Why keep someone who would rather be elsewhere?