The Bulgarian hitman is the number one summer target for the Reds.
But reports that the Premier League and Champions League winners have had a £28m offer accepted by the London club are wrong.
United's chief executive David Gill has still not lodged a bid for the 27-year-old.
He will fly out with the Reds touring party to South Africa on Thursday but could make contact with Spurs before the trip. United's valuation of Berbatov is well below the £30m coach Juande Ramos claimed it would cost buyers during the last January transfer window.
Tottenham are looking for replacements and United may help them in their quest by possibly offering Louis Saha as a makeweight in the deal.
The Parisian wasn't involved in United's pre-season friendly at Aberdeen last Saturday.
Agreement
If United and Spurs can come to some agreement there is no doubt Berbatov will need little persuading to make the switch.
Former White Hart Lane boss Martin Jol, who lost his job at Spurs last October and is now coach at Hamburg, says a move to Old Trafford was always uppermost for the Bulgarian.
Jol said: "I always had a good relationship with Dimitar. But the trouble is he wanted to go to United. It was in his mind and I could do nothing about it."
Meanwhile, Blackburn striker Roque Santa Cruz has played down speculation he is seeking a move away from Ewood Park.
United have been linked with the Paraguay international who scored 23 goals last season.
However, after spending the past month in his homeland, Santa Cruz revealed he is ready to return to England and continue his Blackburn career.
He said: "A lot of people said my transfer to a bigger club was about to happen, but I live in the present and I'm focused on Blackburn.
"I'm happy for the good season that I had and the important goals that I scored.
"I am motivated by the other teams' interest, but if I am not transferred then I want to have a good season at Blackburn."
What should be United's spending limit on Berbatov? Have your say.
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Diogenes10 (15/07/2008 at 09:18)