Chelsea have offered a four-year deal to land Wembley as their temporary home during Stamford Bridge's redevelopment, putting Tottenham's chances of using the national stadium in doubt, according to their chairman Daniel Levy.
Chelsea are currently planning a £500m revamp of the Bridge and have indicated to the FA their need for another home for at least three seasons, possibly four, despite not yet knowing when they can begin work in SW6.
Spurs therefore face an anxious wait to see if they can use Wembley for the 2017/18 season whilst they build their new ground adjacent to White Hart Lane - and supporters may have to wait until 2017 to find out where they will spend that campaign.
The north London club's contingency plan is MK Dons' Stadium MK in Milton Keynes - more than 50 miles from Tottenham - and Sky sources understand a deal has already been verbally agreed for its use.
But Tottenham are still determined to share Wembley with Chelsea and have urged the FA to do the right thing for both clubs.
Speaking at a recent meeting with the Tottenham Hotspur Supporters Trust, Levy said it was Chelsea who persuaded the FA to consider a Premier League club playing at Wembley after they had previously rejected the idea.
And although he acknowledged the FA has a desire to treat clubs equally, the Spurs chairman believes a four-year deal is attracting them far more than Spurs' one-year deal, despite the likelihood of per-season income being the same from both clubs.
Levy confirmed to - Tottenham Hotspur Supporters Trust - THST that the Wembley board will give a recommendation to the FA board, which will make the ultimate decision, and the FA is now considering the practicalities of a ground-share.
It was understand that, until that is decided; no further discussions with the clubs in question can take place.