Kane was 33/1 to join United before the start of business this morning but it’s now into 4/1 after a heap of big bets.
The move stunned insiders at the company, with a spokesman admitting there has been ‘total shock’ at the Friday market move.
Paddy Power spokesman Lee Price said: “We are laying Harry Kane to go to Manchester United – it’s come from nowhere.
“The bets have just kept on coming and we’ve had to keep slashing and slashing the price. It seems punters can’t get enough of it.
“It appears United really could get their man and that Kane may be heading to Old Trafford.
Real Madrid had been the 2/1 favourite to get Kane this summer but they are now out to 4/1 too.
England captain Harry Kane was this week shortlisted for The Best FIFA Men’s Player 2018 award.
The period covered July 3, 2017 to July 15 this year and the 10 nominees were selected by a panel of football experts.
Gareth Southgate’s side qualified for the 2018 World Cup with an unbeaten record before going on to reach the semi-finals, eventually finishing fourth in Russia.
Tottenham forward Kane won the Golden Boot with his six goals as England produced their best World Cup finish since 1990, coming on the back of the 30 he scored during the Premier League season.
And he is confident he can recover from the fatigue of a taxing World Cup campaign as he aims to return to action for the start of the new season.
“I want to be playing in four weeks’ time,” Kane said. “We’ll have to talk to the gaffer (Mauricio Pochettino) at Spurs. It will be a couple of weeks (off).
“The most important thing is mentally (to be ready). Physically, this has been our pre-season. We tick over and are not going to just do nothing for two weeks. We will ease our way into it.
“Physically your body will take you where you never thought it would. It’s always mentally. We train all year round. With the season starting soon it will be hard, but that’s something we have to deal with.”
Kane, the Premier League’s top scorer in two of the last three seasons, has already set targets for a goalscoring return to action.
“I will hopefully be back for the first game and hopefully try and score in August (for the first time in the Premier League) this year,” he added.