The winger scored the Blues' first goal of the evening as they came from behind to win all three points in a hectic London derby.
Sancho fired in with a stunning strike and, although it helped spark Chelsea back into life, fans have loved what he did later in the match.
After Enzo Fernandez put them 3-2 ahead with a fine finish, Sancho ran over to the away end to celebrate with the travelling fans.
He the picked up the corner flag, which has the Spurs badge printed on it, in front of him and threw it onto the ground with a grin.
It's a moment that many may have missed amid the celebrations but Chelsea fans on social media delighted in Sancho's actions.
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It's a moment that many may have missed amid the celebrations but Chelsea fans on social media delighted in Sancho's actions.
Taking to X, one happy supporter said: "Oh I love him so much,"
"Sanch been propa Chelsea since day 1," added a second.
A third said: "Sancho man of the match for me."
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"Sancho throwing away the Spurs corner flag, he's a real Chels," added a fourth.
Sancho's goal was his second for Chelsea since signing on loan from Manchester United in the summer.
It came just four days after he netted his first in their 5-1 thrashing of Southampton, although this one proved more crucial.
Chelsea fell behind after five minutes when their former striker Dominic Solanke scored following a Marc Cucurella slip.
Dejan Kulusevski doubled Spurs' lead moments later with a low and slow strike that nestled into the bottom corner.
Sancho responded in the 17th minute with an excellent finish from outside the area ahead of Chelsea's second half turnaround.
Cole Palmer equalised with a penalty after a rash Yves Bissouma foul on Moises Caicedo on the approach to the hour mark.
Enzo Fernandez fired the Blues ahead for the first time shortly after, doing so with a well-executed half-volley.
Palmer sealed all three points with an exquisite Panenka penalty that Spurs goalkeeper Fraser Forster could only watch as it went in.
The hosts scored a consolation through Heung-min Son in stoppage time as Chelsea ran out as winners in north London.
Spurs will also have to deal with injuries to Cristian Romero and Micky van de Ven, who both returned to the line-up after recent absences.