Spurs are in talks with Porto to sign Luis Diaz and are willing to pay up to 55 million dollars.
Sources in Portugal say that Spurs are prepared to offer 45m up front and 10m in performance-related add-ons.
The 25-year-old has 16 goals and six assists in 28 games for the Portuguese side this season.
For a more accessible video player, please use the chrome browser.
Porto won the Portuguese Cup and a Portuguese title in the summer of 2019, thanks in part to the work of Club Junior's Juan Carlos Diaz.
At last summer's Copa America, he was the tournament's top-scorer with four goals, and he helped his country to third place.
The north London side could be in for a busy final week of the January transfer window as Antonio Conte wants to rebuild his squad.
Adama Traore is believed to be able to play either as a right wing-back or further forward, which is why Spurs are close to completing a deal for him.
For a more accessible video player, please use the chrome browser.
Sky in Italy is reporting that Spurs are looking at a number of players before the deadline, including a player from Fiorentina.
AC Milan's Franck Kessie is out of contract at the end of the season and Spurs are interested in him.
Dele Alli was left out of the squad for the game against the Blues, with the latter taking to social media to say he was in good physical condition.
Paris Saint-Germain are in talks about taking the France international on a loan, as he can leave Spurs this month.
According to The Transfer Show, there are other English clubs that have shown interest in Luis.
For a more accessible video player, please use the chrome browser.
The video player is not loading yet.
The current time is 0:00.
0:00
Remaining time is :0.
The current time is 0:00.
0:00
Remaining time is :0.
Spurs are in talks to sign Luis Diaz from Porto. Portuguese sources have told us that Spurs are willing to pay 45 million dollars for him. The two clubs are not that far apart.
Diaz is a winger. He has two-and-a-half years left on his contract. They were interested in signing him. Many clubs have been watching him.
There were scouts from Manchester United at Porto's game this weekend.
Sky Sports reporter, Declan Olley.
Spurs fans have been here before. In the summer of 2012 there were even Joao Moutinho and Bruno Fernandes. They were close to being men. The big-name signings the club were set to make fell through.
The false dawns have become all too familiar for Spurs fans and they are not likely to settle for another repeat with Porto's Luis Diaz, nor will head coach Conte.
The next two windows are crucial for the future of the Italian at Spurs. Spurs have the chance to get back into the top flight and start competing for honours. Spurs will not drift further from the elite if they fail to match his ambition.
Daniel Levy is serious about backing Conte. It would be 888-282-0465 888-282-0465 888-282-0465 888-282-0465 888-282-0465 888-282-0465 888-282-0465 888-282-0465 888-282-0465, which would be the second-most expensive signing in Spurs history.
The move makes sense on the field. Harry Kane and Heung-Min Son have scored 56 per cent of the team's goals in the Premier League since the start of last season. In 37 appearances for club and country this season, Diaz has scored 20 goals, and he could bring the extra firepower to the squad.
There is no doubt that he would be a great signing. Spurs fans have been here before, and until he is wearing the shirt, they will continue to question the club's commitment in backing the best manager they could possibly have right now.
His headline stat in the Portuguese Primeira Liga this season suggests he provides serious goal threat, but also offers so much more.
The winger ranks top for goals, shots and touches in the opposition box and is among the elite for winning back possession in the final third and attempting fast breaks.
The top five per cent of wingers in Europe's top leagues hit the outer rim across a raft of attacking metrics, according to the radar graphic below.
The maps below show his goal threat in the past two seasons and show that he is the most potent from his left channel.
His most striking attribute is participation in overall play, with above-average numbers for passes in the final third, but the graphic below suggests he also tracks back to support the team.
When looking at his goal and passing averages, he emerges among an elite group of players in Europe's top leagues, with returns on par with Benzema and Salah.
His heat map shows his work-rate with a lot of activity in his defensive half, while his ability to get possession high up the pitch would suit a high-press style.
Who will be moving in January?
The January transfer window closes at 11pm on Monday January 31.
Sky Sports has a dedicated Transfer Centre blog where you can keep up-to-date with all the latest transfer news. Sky Sports News has the ins, outs and analysis.
You can follow every Spurs game this season on Sky Sports and watch the match highlights for free after the game.
Want the latest from Spurs? Stay up to date with the latest news and results from Spurs, watch their goals and video, and follow their games on Sky Sports.
You can get all this and more by using the Sky Sports Scores app and setting Spurs as your favourite team.
Find out how to get Sky Sports, listen to the best Premier League reaction and expert analysis with the Essential Football, follow the Sky Sports social accounts, and keep up-to-date with the Transfer Centre.