Modric, who has joined from Dinamo Zagreb, said: "I'm not concerned by Keane's departure.
"This team has a great ambition regardless of Robbie Keane leaving. Even if Berbatov leaves I'm sure they will find another great player.
"This club really has a great future. We have a lot of positive things.
"I agree the team needs great players but I'm also certain that if Berbatov leaves that they will bring in other phenomenal players.
"I hope that Berbatov stays as he is a great player and he means a lot to the team.
"It is not my area to decide who gets sold. My thing is to play as well as I can possibly can."