Tottenham Hotspur completed the signing of Lyon midfielder Tanguy Ndombele on Tuesday.
The club's official Twitter account announced the France international has signed a deal with Spurs until 2025.
Alasdair Gold of Football.London reported the fee will be £63 million, which would be a club record for the UEFA Champions League finalists.
Spurs tweeted a video welcoming their major capture:
The 22-year-old is one of the brightest prospects in Europe and has impressed in the centre of the park in Ligue 1.
Ndombele features as a conventional central midfielder but can also play deeper in front of the defence as an enforcer.
Mauricio Pochettino didn't make a major signing last term but guided his team to a top-four Premier League finish and a European Cup final appearance, with Spurs losing 2-0 to Liverpool in Madrid.
Spurs also signed Jack Clarke from Leeds United on Tuesday, but he is set to go back to the EFL Championship side on loan for the 2019-20 season.
Tottenham's official website announced the 18-year-old has signed a deal until 2023.