Key members of the Spurs squad have performance-related bonuses written into their contracts which vary depending on how far they advance in the Champions League, but these bonuses will not be triggered at all if Mauricio Pochettino's side finish outside the top four.
Tottenham are already struggling to keep their top players for financial reasons, with Toby Alderweireld and Danny Rose among the players most likely to leave this summer. The likes of Harry Kane, Dele Alli and Christian Eriksen may also be in demand if Tottenham miss out.
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Tottenham are chasing a third consecutive top four finish, having previously competed in Europe's top competition only twice in their history before Pochettino was appointed.
For the first time, finishing 4th in the league will guarantee direct entry to the group stages of the competition without the need for a qualifying game.