Gedson Fernandes has completed his medical with Tottenham ahead of an 18-month loan deal from Benfica.
A formal announcement on his move is expected in the next 24 hours.
Benfica agreed deals with Tottenham and West Ham but Fernandes has opted to sign for Spurs, who are managed by fellow Portuguese Jose Mourinho.
Spurs will have an option to buy Fernandes for 50m euros (£42.7m), after Benfica accepted a higher loan fee for the 21-year-old.
Personal terms between the player and club are not expected to be a problem.
Tottenham want to sign a midfielder following the injury to Moussa Sissoko, who has been sidelined for three months after undergoing surgery to the medial collateral ligament in his right knee.
Chelsea have also been interested in signing Fernandes and offered an 18-month loan deal with an obligation to buy for £55m, provided the player features in at least half of the games during the loan spell.
Fernandes' release clause is £102m but Benfica have conceded they will not get close to that figure for a player who is out of favour and is reported to have fallen out with head coach Bruno Lage.
How to follow the January transfer window with Sky Sports
Sky Sports will bring you the very latest news from the January transfer market with the return of three shows.
Start your day with Good Morning Transfers at 9am as our team of reporters bring you the latest news and insight. Transfer Talk then follows at midday delivering analysis of the biggest stories. Then join us at 7pm for the definitive round-up of the day's news with The Transfer Show.
Meanwhile, the Transfer Talk podcast will also be back at the turn of the year with more expert analysis from here and across the continent.
And as well as tuning into Sky Sports News, don't miss a thing with our dedicated Transfer Centre blog.