Tottenham boss Mauricio Pochettino says it might be two years before Tanguy Ndombele reaches his best.
The Frenchman, who became the first senior arrival in the Tottenham squad since Lucas Moura in January 2018 when he moved from Lyon for 55.5million in July, impressed in the 5-0 Champions League win over Red Star Belgrade.
But Pochettino says: "We cannot assess him [Ndombele] enough to say he is doing well or not so well.
"For me it's fantastic the things he adds to the team, I am so happy with him like I am so happy with different players.
"Still for me, when you sign a player, despite the amount you pay, with the profile of Tanguy Ndombele or Giovani Lo Celso or Ryan Sessegnon you need minimum one year and a half, or two years. Look at what happened with Son or Sissoko, they started to perform in year two, year three.
"That is why when you are so young today the market is the market, you cannot judge the player because you paid some kind of amount. He played two years in Lyon and moved to England where everything is new, but the quality is there. They need time to show their real quality."
