Davinson Sanchez is having a medical on Tuesday ahead of a club-record move to Tottenham, according to Sky sources.
Spurs confirmed on Friday that a deal, believed to be worth up to £42m, had been agreed with Ajax and the Colombian international had signed a six-year contract, subject to a medical and work permit.
It is believed there will be no problems with the work permit. The 21-year-old has been capped twice by Colombia.
"I would like to thank the coach, management, players and fans of Ajax. It is a great move for me to come here to develop my career," Sanchez told the Spurs website on Friday.
"I am very excited to be signing for such a famous club as Tottenham Hotspur. I am looking forward to working with Mauricio Pochettino and the players and meeting everyone there."
Sanchez was Ajax's player of the year last season and was also a target for Barcelona and Inter Milan.
He joined Ajax from Atletico Nacional last summer and made 43 appearances, scoring six goals, in his first season in the Eredivisie.