Tottenham say it is "highly unlikely" that they will be able to move into their new stadium for the start of the 2017/2018 season.
A High Court challenge over the land they need is holding building work up.
Spurs say they have revised the construction programme to make it quicker, which means they will have to move away from White Hart Lane for a season.
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They are also looking at what they call "alternative stadium options".