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Tottenham have completed the signing of Ajax defender Davinson Sanchez for a reported club record fee of £42million.

Spurs announced a deal for the 21-year-old had been agreed on Friday and the Colombia centre-back underwent a medical and finalised the remaining paperwork on Wednesday.

Sanchez has agreed a contract until 2023 and the fee is believed to eclipse the previous club record of £30million which Spurs paid Newcastle for midfielder Moussa Sissoko last summer.

"This is a massive opportunity for me because of what Tottenham represents, not just here in England but around the world," said Sanchez, whose move is subject to the receipt of a work permit.

"It's a huge step forward in my career and will allow me to continue developing and achieving big things. This is a great chance."

Sanchez joined Eredivisie side Ajax in June last year on a five-year deal after leaving Atletico Nacional in his homeland.

He played in last season's Europa League final, which Manchester United won 2-0, and was named Ajax's player of the year in May.

Mauricio Pochettino has been keen to add to his squad this summer and the completion of Sanchez's switch came on a busy day for the Tottenham boss.

Spurs also brought in goalkeeper Paulo Gazzaniga from Southampton on Wednesday and extended the contract of right-back Kyle Walker-Peters.

Gazzaniga spent last season on loan at Spanish club Rayo Vallecano and has penned a contract until 2022 and will provide back-up to Hugo Lloris and Michel Vorm.

The 25-year-old, who started his career at Valencia before moving to England with Gillingham in July 2011, said: "I feel amazing and am so happy to start training with the boys.

"This is an amazing club and the facilities are unbelievable."

Walker-Peters, meanwhile, has signed a new contract which will keep him at the club until 2020.

The 20-year-old made his first-team debut against Newcastle on the opening day of the new Premier League season in a 2-0 win and was named man of the match at St James' Park.

He said: ''To make my debut and get three points, get man of the match, I am delighted of course and it just shows that I need to kick on now and it makes me want more of that."