The Tottenham Hotspur midfielder had impressed in recent weeks in an advanced position. So much so that Mauricio Pochettino built up enough faith in the Belgian to give him a lead role and rest both Christian Eriksen and Nacer Chadli.
How Dembele let Pochettino - and the Tottenham fans - down. The 27-year-old looked disinterested, constantly lost the ball and produced a performance nowhere near his best. It'll be back to the drawing board for Dembele, who has now disappointed in a number of different positions this season.
While Danny Rose continues to prove an enigma at White Hart Lane - the 24-year-old would struggle to defend in the lower leagues but often looks unstoppable going forward - Kyle Walker's role at Spurs is becoming less clear.
What does the right-back offer his side apart from pace and an occasionally encouraging performance? That might be being harsh but, against West Ham, Walker was certainly below par.
The full-back was anonymous going forward for Tottenham and failed to stand up to the Hammers in a defensive capacity, too.
The 23-year-old is so hit and miss. Against West Ham, however, it was all miss.
Some have defended Townsend for 'at least trying' on Sunday afternoon but enough is enough. Erik Lamela and Townsend continue to frustrate down the right-hand side.
Why was Aaron Lennon let go when Pochettino is left with two wingers so clearly lacking in any end product?