If Tottenham do decide to expand White Hart Lane to around 52,000, they would be looking for a new home during the anticipated two years of renovations.
That could coincide with West Ham's final two seasons at Upton Park and may provide a timely financial boost. Tottenham are considering other sites and plan to make a final decision by the end of June next year.
Tottenham and West Ham have noted Arsenal's success in maximising the knock-on benefits of a new ground since their move to the Emirates Stadium last year, and all three clubs may be in the running to stage World Cup matches should the FA's bid to host the 2018 competition prove successful.
West Ham have secured negotiating rights with the London Development Agency on a 32-acre site next to the West Ham underground station for a possible 60,000-seat stadium to open by 2012.