As it stands, Spurs sit just one point outside the Premier League relegation zone.
An email to supporters read: "As previously communicated, General Admission Season Ticket renewals for 2026/27 open today March 12). In line with our Ticketing Charter published in March 2024, we are committed to opening renewals by no later than 15 March each year.
"We recognise the seriousness of the current league position of our men's team and, following discussions with our Fan Advisory Board and the Tottenham Hotspur Supporters' Trust, can confirm the renewal period for 2026/27 will now remain open for an extended period until Sunday June 7 to ensure fans have full clarity of next season before renewing."
The new date is two weeks after the season's final game against Everton at home, after which Tottenham will know whether they've avoided relegation.