Sevilla missed a chance to strengthen their hold on third place in La Liga after conceding an 87th-minute own-goal in a 1-1 draw with Levante on Monday.
Luuk de Jong put Sevilla ahead a few seconds into the second half but a fluke play near the end gave the hosts the draw as a cross partially saved by goalkeeper Tomas Vaclik ricocheted off defender Diego Carlos straight into their own net.
Sevilla would have opened up a six-point gap to fourth-placed Real Sociedad had they held on to victory and would also have moved within six points of second-placed Real Madrid.
The top four teams in the Spanish League qualify for the Champions League and they last played in Europe's top club competition in the 2017-18 season, reaching the quarter-finals.
Real Sociedad can move to a point behind Sevilla if they win at Alaves on Thursday.
Fifth-placed Getafe and sixth-placed Atletico Madrid are five points behind Sevilla ahead of their midweek games.
"It's not a good feeling," Sevilla coach Julen Lopetegui said. "We played well for 75 minutes but in the end we conceded too much space and they improved.
"It's my responsibility because with five substitutions the team was supposed to get better, but it was the opposite."
The game at Levante was Sevilla's second after the league resumed amid the coronavirus pandemic.
The league got going on Thursday with Sevilla beating city rivals Real Betis 2-0.
Betis followed the derby loss by drawing at home with Granada 2-2 in a game in which they rallied to take the lead with goals in the 85th and 87th minutes, but conceded an equaliser a minute into stoppage time.
Betis, who defeated Real Madrid in their last match before the league was suspended, stayed in 13th place while Granada moved to eighth.