Tottenham started the season with a comfortable 2-0 victory over Newcastle, but in their first home match at Wembley last weekend they a 2-1 defeat against league champions and rivals Chelsea with a Michy Batshuayi own goal failing to cancel out two from wing-back Marcos Alonso.
Having come through the ranks at Atletico Nacional in his native Colombia, Sanchez spent just one season in the Eredivisie before completing his move to England.
"He's so young. He's one of the most important young and talented players in Europe".
"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. Always hard for him. "We are waiting, we will see", the Tottenham boss said in the press conference ahead of the game.
"He trained with us yesterday and will train with us again".
The Colombia global defender joined Spurs from Ajax for a club-record fee but may be forced to sit out the meeting at Wembley if his permit is not issued in time. "Today, I was talking for one hour with Toby".
"It's unfair on Mauricio Pochettino who I think is a good coach, but Spurs will not be winning anything this year - maybe the League Cup - but the club is in trouble because of its policy on wages". "That is why we made the effort to try to sign him".
"He is so aggressive, so fast, and he loves to play with risk at his back", added Pochettino, referring to Sanchez's ability to play in a high defensive line.
Meanwhile, Tottenham have confirmed that the game against Burnley will still come too earlier for Lamela, Rose and Nkoudou, with the latter expecting to be back after the coming global break.
But Pochettino insists he is going nowhere and said: "It not related". The only important thing is to say that he's so young.
"We have unbelievable groundsmen and the Wembley groundsmen, they're working very close with each other, to be sure we will find Sunday in the condition we need to play".