Atletico Madrid were held by 10-man Qarabag to a 1-1 draw in Group C of the Champions League on Tuesday, further damaging their chances of advancing to the knockout stages.
Having qualified from the group stage for the past four years, Atletico are still winless after four matches. They trail second-place Chelsea by four points and group leader Roma by five.
Qarabag broke the deadlock with a header by midfielder Michel after a corner kick in the 40th minute at the Wanda Metropolitano Stadium.
Atletico equalised with a stunning side-foot shot from outside the area by Thomas Partey in the 56th.
However, Diego Simeone's team failed to find a winner despite Qarabag going a man down a couple of minutes later when Pedro Henrique was sent off for a dangerous high kick in a challenge with Atletico defender Diego Godin.
Both sides finished with 10 men for the final minutes after Atletico defender Stefan Savic was sent off with a second yellow card.
Roma defeated Chelsea 3-0 at home in the night's other Group C match.