That’s according to former Crystal Palace chairman Simon Jordan.
England international Kane, 24, has had another fine start to the season for Tottenham.
The striker has netted 11 goals in nine appearances in all competitions under Mauricio Pochettino this campaign.
And pundit Jordan says Kane could end up at United or Real next summer.
Jordan said to talkSPORT: “I’m not trying to be disrespectful to Tottenham, but if Manchester United come calling for Harry Kane, or Real Madrid – with an ageing forward line – come calling for Harry Kane, I think in a year’s time it will be very difficult for Harry Kane, at his peak, with Tottenham potentially not winning the Premier League and maybe struggling to even get into the Champions League, to resist the opportunity to move along.”
Kane will be in action for England on Thursday night when Gareth Southgate’s men face Lithuania.
Pundit Chris Sutton is a huge fan of the Spurs star and the former Celtic ace would take Kane over Manchester United’s Romelu Lukaku.
"He [Lukaku] is [able to bully centre-backs]," said Sutton.
"And we had an argument with Paul Ince last week and he was talking some nonsense about Harry Kane and Lukaku.
"Harry Kane is a good all-round, brilliant all-round striker as well. His link-up is sensational.
"I would have him ahead of the other three at the moment.
"Morata has started the season so well. It's so hard to pick, isn't it. They're all top quality players.
"Harry Kane, he's the one player I think who could catch Alan Shearer's record of 260 [Premier League] goals if he stays fit."
