Michael Dawson has left Spurs after almost 10 years at the club as he has joined Hull City on a three-year contract for £6 million.
The former Tottenham skipper was a true leader for the Lilywhites during his time at the club, but his departure comes at the right time as he had fallen down the pecking order at the club.
Dawson is replaced by Federico Fazio at Tottenham and although the club have yet to confirm the signing of the Argentine defender, an £8 million deal move from Sevilla has been agreed according to the Telegraph.
The apparent new arrival will certainly replace Dawson's aerial superiority at the back as at 6ft 5ins, Fazio will surely adapt to life in the Premier League without too much difficulty.
He is three years younger than Dawson at 27, and will expect to be a regular under Pochettino at White Hart Lane despite the strong competition for places at the back.
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Neither is conclusively judged as a better defender based on last season's statistics, although Fazio did score twice as Dawson failed to find the net in more appearances.
The Argentine defender won more headers per game as well as interceptions than Dawson, though the former Spurs captain made more tackles and clearances per appearance.
A key statistic here could be that Dawson was better in possession than Fazio as he completed more of his passes than the Sevilla man could manage last term.
Pochettino's style of play requires all his players to be able to move the ball on quickly and accurately, though Dawson seems better at this than Fazio based on last seasons performances.
Dawson's problem last year was his agility and he struggled to deal with the high line that Spurs deployed on several occasions, and Fazio will cope much better with that.
The 27-year-old won the Europa League with Sevilla last season, and although he is not necessarily a better defender than Dawson, he should be able to cope with Pochettino's system much better.