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Marcelo Bielsa's men stunned the Blues in the opening five minutes as Patrick Bamford calmly rounded Edouard Mendy before slotting the ball into the back of the net.
Chelsea were presented with the perfect opportunity to snatch a goal back at Stamford Bridge not long after, only to be denied by Werner of all people.
The Blues were awarded a corner and the ball was whipped into the box, with former Arsenal striker Giroud flicking in a goal-bound header.
However, Werner badly connected with the ball at the back post and skewed it at Illan Meslier.
The 24-year-old German striker then shockingly poked the rebound up and onto the crossbar.
Fans were stunned by what they saw and took to Twitter to slam Werner for his goalline clearance.
"Timo Werner with the best clearance," one fan said.
While another tweeted: "Great clearance by Werner stopped a certain goal [sic] pity it was for his team."
A third said: "Werner with a world-class goalline clearance."
And a fourth finally added: "As good a goalline clearance as you're going to see from Werner, that."
Giroud would eventually manage to cancel out Leeds' opener in the 29th minute.
Chelsea and Leeds head into half-time 1-1 at Stamford Bridge.
Full-time result: Kurt Zouma and Christian Pulisic both scored in the second half to seal a 3-1 victory for Chelsea against Leeds.
Frank Lampard's men have moved top of the Premier League table thanks to their win over Leeds.
Featured Image Credit: Sky Sports
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