Michael Bridge has warned Tottenham they must get something from their trip to West Ham on Sunday or another defeat will ruin the feel-good-factor right now.
Spurs have won their last two Premier League matches, but it wasn't so long ago that Nuno Espirito Santo appeared to be fighting for his job following three consecutive defeats back in September.
How have Tottenham performed this season?
It's been a strange start to the campaign for Tottenham, who're only four points behind leaders Chelsea and only goal difference is keeping them outside the top-four despite some extreme highs and dramatic lows.
Nuno's side started the campaign with three straight 1-0 victories, which saw Spurs top the table heading into the first international break and saw the Portuguese named Premier League manager of the month.
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But Tottenham's season quickly spiralled out of control after they lost three London derbies on the bounce, conceding three times in each to slip to 11th in the top-flight standings.
They've responded by beating Aston Villa and Newcastle to climb back up to 5th and could move into the Champions League spots with three points at the Hammers this weekend.
But Bridge has warned them that the consequences of yet another derby defeat at the London Stadium could be huge.
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What did Bridge say?
He told GIVEMESPORT: "Tottenham have been pretty poor in London derbies over the last couple of years. They need to get something there because it will dip again if they lose."
What's Tottenham's record like recently in London derbies?
Tottenham have fared generally quite decently against their local rivals over the years, although their record in recent times is poor.
They've struggled against Chelsea, collecting just one point from a possible 18 available, whist they've been quite even in north London derbies despite suffering two defeats at the Emirates in 2021.
Spurs have performed better against Crystal Palace, which doesn't come as a great surprise, with their 3-0 loss at Selhurst Park last month their first Premier League defeat against the Eagles for almost seven years.
But West Ham has proved another difficult fixture, with the Hammers collecting four points last season, including that remarkable 3-3 draw when David Moyes' side battled back from 3-0 down.
However, Tottenham have won four of their six trips to the London Stadium, with no draws in this particular fixture since November 2007, which should give Spurs reason for optimism when they make the short trip across the capital on Sunday.