BBC Sport says Tottenham have turned to a man who played a major role in the development of Arsenal's Emirates Stadium to help them build a venue of similar quality.
Tony Winterbottom, formerly of the London Development Authority, is now masterminding plans to expand Spurs' White Hart Lane ground to about 52,000.
The project would cost in the region of £300m of which £150m would be borrowed.
But it would mean Spurs vacating White Hart Lane for two seasons, prompting a possible ground share with West Ham.
Another solution might be to share the Emirates Stadium with Arsenal but that seems fraught with difficulty, particularly with the present rivalry between the fans.
Consequently, there is also talk of Tottenham playing some matches at a ground outside London.