Game on! Atleti shock Real Madrid within 30 seconds of UCL second leg 😲 | OneFootball

It was always going to be tough for Real Madrid to face cross city rivals Atleti in the second leg of their Champions League Round of 16 tie.

But little did their know that their 2-1 advantage would be wiped out within 27 second of the kick off at the Wanda Metropolitano.

After being left out of the starting XI in the first leg, Englishman Connor Gallagher put Atleti ahead, sliding in from close range to set up a fascinating 90+ minutes of the rest of this tie.

Even more special was the fact this was Gallagher's first ever Champions League strike, and the fastest in the competition this season, as well as being Atleti's fastest ever UCL goal.

Who will make it through to the quarter-final? Let us know what you think in the comments.

📸 JAVIER SORIANO - AFP or licensors