Atletico Madrid Played A '6-3-1 Formation' Against Chelsea In Champions League And Still Managed To Lose

Diego Simeone's men clashed with the Blues at the National Arena in Bucharest, Romania, in the first leg of their round-of-16 clash.

And Atletico, who are known for their strong defensive displays, turned that up a notch as they frustrated Chelsea before succumbing to a 1-0 defeat on Tuesday.

However, fans noticed that Simeone deployed a formation that featured six Atletico players in the backline.

Chelsea supporters were furious with the Atletico boss' tactics and blasted him for his 'over-the-top' defending style.

"How do Atletico fans watch this s**t every week," one fan said.

While another pointed out: "Not sure why they are playing so defensively when Chelsea was just passing sideways [sic] now they have started attacking."

Someone else tweeted: "This is exactly why I didn't watch this game--I saved myself some leisure time. I knew this is how Atletico would play."

And a fourth added: "Can't believe what [I] am seeing from Simeone."

The return leg will be played at Stamford Bridge on 17th March.