Crucially chairman Daniel Levy is unlikely to be swayed even by a huge offer. United made Monaco's heads turn with a mega-money deal for Anthony Martial on transfer deadline day.
The Sun report: "Undoubtedly, Spurs could do with the £50-60m his sale would generate. But Levy knows cashing in could ruin his club’s Champions League chances and hopes of filling their new home."
Short and long term view, lesson learned?
After selling Gareth Bale for £86 million to Real Madrid in 2013, Tottenham had hoped the cash would propel them forwards from the edge of the Champions League places to challenging for the title.
Instead the five of seven players bought flopped and have been sold, with just Christian Eriksen and Nacer Chadli remaining, and they remain in the same situation - but have lost a popular player.
Selling Kane to Manchester United would be even worse, and every goal he would score for the Red Devils would be painfully felt by Spurs fans.
With Kane a vital part of the club's success for the next 10 years and even more, form and health permitting, selling him would cause distrust among fans at a crucial time for them.