Talks for Pedro Porro have dragged on for the entire month, with Tottenham and Sporting hoping to conclude negotiations on Thursday.
Spurs close in on Pedro Porro
Having had at least one bid rejected, Spurs have indicated a willingness to meet Porro's €45million (£39m) release clause and believe Sporting are now dragging out negotiations.
According to The Guardian, Spurs have tried to structure a deal that would see them pay less immediately, with a sell-on clause relating to Marcus Edwards discussed.
Tottenham are entitled to 40% of any fee Sporting receive for selling Edwards, one of their former players. They have offered to reduce that figure in exchange for paying less for Porro, a Spain international.
Conte needs an upgrade at right-back
Despite the back and forth, there is now confidence that the 23-year-old Spaniard will become Spurs' second January signing following the capture of Villarreal winger Arnaut Danjuma on loan yesterday.
Spurs coach Antonio Conte has long wanted an upgrade at right wing-back, where Matt Doherty and Emerson Royal have both underwhelmed in the role.