Tottenham boss Mauricio Pochettino says he's been following new signing Davinson Sanchez since before his move to Ajax.

Pochettino moved to Espanyol from Newell's Old Boys at the age of just 22 and admits there were plenty of challenges - but ones he overcame and reckons Sanchez will also deal with.

"When he arrived at Ajax from the beginning he showed his quality, started to show his character and personality, I think he was the best player on Ajax in his first season," he said.

"That showed that he is a player with big character and personality, and with a lot of potential.

"First of all it (the challenge) is to adapt yourself. I moved with my wife, we were not scared, but you are waiting because you don't know.

"From America, you come to Europe, you don't know what you will find here. But him, he's unbelievable: he speaks very good English, and from day one when he arrived I think he is like all the players here. Yes, he is very welcome with the team-mates and he is one of us.

"It was difficult at the beginning, (he has) all the characteristics he has are for success here."