Porro has a release clause in his contract with the Portuguese side which is worth £40million and Spurs are understood to be willing to meet it.
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Antonio Conte has made signing a right-sided wing-back his main priority this transfer window.
Porro joined Sporting from Manchester City back in 2021 after failing to make a first team appearance for the Premier League champions.
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Since then, the right-back has made 97 appearances for the club, scoring 12 goals and grabbing 20 assists along the way.
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Chelsea are also keen on the player, but it seems that Tottenham are leading the chase to wrap up a deal.
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It remains to be seen what this means for Matt Doherty, Emerson Royal and Djed Spence, all of whom are currently a part of Conte's first-team squad and can play at right wing-back.
This will make the Portuguese side short of a full-back and The Athletic reports they've made enquiries to Brighton over Tariq Lamptey.
Sporting would look to bring Lamptey in until the end of the season for the Ghana international, who's made just one start in the Premier League this season.