That is the report from Goal.
They claim that the Red Devils have an agreement in place to sign the Belgian centre-back before Thursday’s 5pm transfer deadline.
But a deal will not be given the green light until Spurs can find a new man to take up Alderweireld’s spot in Mauricio Pochettino’s squad.
United have been linked with a vast number of central defenders this summer with contrasting rumours concerning interest in Harry Maguire, Yerry Mina and Jerome Boateng over the last couple of days.
But Alderweireld is believed to have been Jose Mourinho’s No 1 target throughout the summer, with Spurs and United having been unable to agree a fee earlier in the summer with the two clubs around £20million apart in their valuations.
No figure has been mentioned but it is likely United will pay in excess of £50m – which would make Alderweireld the club’s most expensive ever defender.
Yet Goal say United will prepare bids for alternative targets in case Spurs pull out of a deal at the last minute.
The two Premier League rivals have had an agreement in place since last week although no progress has been made in completing the transfer since then.
Goal suggest that the in-tunnel meeting between executive vice-chairman Ed Woodward and Mourinho after United’s loss to Real Madrid in Miami was related to the breakthrough in Alderweireld talks.
It is said that United’s fear that Spurs could pull out was the catalyst behind their interest in Yerry Mina of Barcelona while they also enquired about Jerome Boateng of Bayern Munich.
But Alderweireld, who also played for Southampton in the Premier League, has always been their first choice and Goal say the experienced defender is keen on the move.
The 29-year-old reportedly fell out with Spurs boss Mauricio Pochettino last season with the Argentine preferring Jan Vertonghen and Davinson Sanchez as his preferred centre-back partnership even after Alderweireld returned to full fitness after injury.
He runs out of contract in north London next year and has shown no sign of penning a new deal, with the player and his representatives having wanted higher wages than on offer.
Spurs have an option to extend Alderweireld’s deal by an extra year but that would trigger a £25m release clause available to be activated next summer.
United will hope that Spurs can make progress in finding a replacement with Mourinho desperate to add quality at the back.
With five centre-backs currently on the books at United, Mourinho is willing to sacrifice the injury-prone Marcos Rojo to free up a space in his squad.
There is no pressure to sell Rojo before making a signing however, with the Argentine available to leave until August 31 – when the window of other major European leagues shuts.