While Jan Vertonghen is looking forward to seeing how Davinson Sanchez fares in the Premier League, Edwin van der Sar felt he should have stayed with Ajax this season.
Tottenham Hotspur signed the 21-year-old Colombian centre back for an initial £28million that could rise to a club record £42m.
He is expected to compete with Vertonghen for a place in the Spurs side and another former Ajax player, Toby Alderweireld.
Speaking to the club's official website, Vertonghen said: "I know people who know him and they are all very positive. They rate him very highly.
"It's always nice to have new players in the squad and we're looking forward to seeing him training. It will mean more competition for places but that's what football is all about.
"Obviously he's coming from Ajax so we have something in common, along with Christian (Eriksen) and Toby (Alderweireld), who also played for them in the past.
"I'd say that the Premier League is more physical than the Dutch league, but Sanchez looks like he has that physicality, so I'm sure he'll do well here."
Van der Sar, Ajax chief executive, meanwhile, explained that Sanchez would have benefited from more time in Holland.
"I think with [Davinson] Sanchez one year was too early. He should have stayed two or three years.
"But sometimes with the financial power that is looming over us in the bigger leagues it's quite difficult for even a big club like Ajax coming from a small league to resist certain transfers."
He added: "We know at a certain point that this league is not strong enough so after a few years, hopefully if you play three, four or five years for the club and give us two or three championships and success in Europe then [in an] ideal world it is the right step to go forward."