The outcome has opened up the title chase, with Atletico Madrid potentially falling out of first place for the first time in 19 games if Barcelona wins their game in hand against Granada on Thursday evening.
The LaLiga Santander leaders faced a weaker Athletic side after Marcelino made adjustments, but the youngsters in the team started with an intensity that was not matched by Simeone’s line-up, which had just one change from the 2-0 victory over Huesca in midweek.
After a sloppy start from Los Colchoneros, Alex Berenguer scored the game’s first goal eight minutes in after a quick counter-attack caught them off guard.
Simeone responded by putting on Luis Suarez, Joao Felix, and Thomas Lemar just before the hour mark, as the trio all returned from injury, but it was not enough to win the game.
With a header from a corner in the 77th minute, Stefan Savic leveled the scores, but it was another corner that would crack Atletico’s hearts.
Inigo Martinez scored with only four minutes remaining, beating Jan Oblak in the Atletico goal.
As a result, Atletico could lose their lead in LaLiga Santander on Thursday, but if Barcelona wins both of their games against Granada and Valencia, they could reclaim the title when they visit the Camp Nou on Matchday 35.
As a result, Atletico Madrid could fall out of first place for the first time since mid-December, while Barcelona could take the lead for the first time this season.
Barcelona now faces Granada, Valencia, Atletico Madrid, Levante, Celta Vigo, and Eibar, while Atletico Madrid faces Elche, Barcelona, Real Sociedad, Osasuna, and Real Valladolid. Surprise Atletico Drop in the LaLiga
The draw on Sunday is a big setback for Simeone and his players, who had led by as many as seven points in January and seemed destined to win the championship. They can no longer make any more mistakes.