Real Madrid coach Carlo Ancelotti said their preparation for Sevilla was below par, after their shock 2-1 loss on Wednesday.
Ancelotti's men led early but were reeled in by the persistent hosts, with two Carlos Bacca goals helping Sevilla move closer to fourth-placed Athletic Bilbao, and within six points of a UEFA Champions League spot.
The Italian tactician said Sevilla's exploitation of Real's defensive frailties meant his side were not deserving of the three points.
"I don't think we deserved to lose," Ancelotti said.
"On the one hand we could have because we didn't prepare well for Sevilla's counter-attacks and that is how they scored both goals.
"We took the lead and could have scored more goals. Then they scored two goals in the same way when we needed more balance."
Ancelotti refused to single out Xabi Alonso for criticism, after the defensive midfielder gave up possession in the lead-up to both of Sevilla's goals.
"Alonso is not at fault, he miscontrolled the ball, but we have to cover his back and we didn't," he said.
"That is where both goals came from.
"Cristiano Ronaldo was annoyed because we were losing the match, nothing more.
"Now, La Liga is more complicated because we are behind (Atletico and Barcelona). It's more complicated but not impossible."
Ancelotti also refuted suggestions Real struggle in big matches, having lost two on the spin against Barcelona and now Champions League-chasing Sevilla.
"It's not a problem. The team has lost against smaller teams," he said.
"La Liga is complicated and it has strong teams and every match is difficult. We have to think about ourselves.
"We lost two matches but we have to believe we can win it. We are behind but we have to believe it is possible."
Real defender Marcelo said he was sorry for the capital club's performance, which has seen them lose their advantage in the La Liga title race.
Atletico Madrid claimed outright lead in Spain's top flight following Wednesday's games on 73 points, one ahead of second-placed Barcelona, while Real (70 points) dropped to third.
"We knew the end of the season was going to be tough. Every game is like a final. We have to fight and keep fighting and apologise to the fans of Real Madrid," the Brazilian said.
|19||José Antonio Reyes|
|9||C. Bacca||19' 72'|
|Coach: Unai Emery|
for M. Marin 71'
for José Antonio Reyes 75'
for C. Bacca 83'
|Mourinho has ´got to grips´ with United - Ferguson|
|Uganda v Mali: A lot at stake for Mali in shot-shy showdown|
|Napoli 1 Fiorentina 0: Callejon heads Partenopei into semi-finals|
|Bordeaux 1 Paris Saint-Germain 4: Cavani, Di Maria secure final berth|
|Watzke: Dortmund would consider €80m for Aubameyang|
|Togo 1 DR Congo 3: Kabananga´s goal streak continues as Ibenge´s men top group|
|Morocco 1 Ivory Coast 0: Alioui stunner sends holders crashing out|
|Romeu earns Southampton extension as Puel targets away goal|
|Sunderland striker Anichebe out for up to 10 weeks|
|Elneny wants to be an Arsenal legend ´like Thierry Henry´|
|Corini leaves Palermo as Ballardini is tipped for fourth return|
|Hernandez leaves Leicester for Malaga|
|Lukas PodGOALski...Gala forward nets five amid J-League links|
|CAS rejects Serbian appeal against Kosovo UEFA membership|
|Thiago back in Bayern training as Arsenal showdown looms|
|Thiago back in Bayern training as Arsenal showdown looms|
|Shearer´s Toon Army ´trump´ the POTUS|
|Rooney´s record may stand forever - Ferguson|
|Carrick expects full-strength United as Wembley return beckons|
|They insulted his mother and then there were monkey noises - Cyprien on Bastia Balotelli abuse|
|No Chelsea regrets for Sampaoli as Sevilla mount title challenge|
|Egypt v Ghana: Cuper backs Elneny to deliver in crucial Group D clash|
|James adds to Zidane´s injury woes at Madrid|
|Zidane wants fans behind Madrid after latest Ronaldo whistles|
|Mason ´continues to make excellent progress´|
|Allegri slams ´stupidity´ surrounding Buffon referee hug|
|Niang in talks over AC Milan exit, confirms Montella|
|Sunderland sign Lescott|
|China-bound Ramos completes loan switch to Granada|
|Rahman to miss ´several months´|
|Leekens quits after Algeria´s AFCON exit|
|Jese has firm Premier League offer, claims Las Palmas president|
|´I´m blessed with golden genes´ - Adebayor insists he is ready for new Premier League chance|
|Messi renewal progressing ´very, very well´ - Robert|
|Neuer expects Clement success at Swansea|
|Klopp calls for Liverpool enjoyment|
|Mustafi talks up Arsenal belief|
|Van Basten still against offside, slams ´nonsense in the media´|
|Rakitic dreaming of career-long Barcelona stay|
|Toure inspired by Ibrahimovic as he explains Chinese Super League snub|
|Kasperczak committed to attacking approach as Tunisia reach AFCON quarters|
|Slimani wants Algeria youngsters to learn from AFCON humiliation|
|Senegal 2 Algeria 2: Slimani at the double as Desert Warriors bow out|
|Zimbabwe 2 Tunisia 4: First-half glut seals progression|
|Adrian: I always wanted to return to Villarreal|
|Togo v DR Congo: Agassa could miss crucial game after vandals hit home|
|Extended Southampton stay on the cards for Sims|
|Bayern hoping for speedy Vidal return|
|Hull sign Markovic on loan from Liverpool|
|Wenger charged with misconduct by FA|
|Deulofeu joins AC Milan - and this time the deal is definitely done!|
|Henderson still playing through pain, reveals Klopp|
|Record-breaking Rooney reveals secret to longevity|
|No ulterior motive behind Van Dijk captaincy call - Puel|
|Carroll ignoring want-away Payet|
|Gerrard´s managerial ambitions ´wonderful news for Liverpool´ - Klopp|
|PSG interested in Guedes, confirms Emery|
|Barca lose Busquets to sprained ankle|
|Pulisic commits to Dortmund until 2020|
|Mason speaking after suffering fractured skull|
|Aubameyang blames poor preparation for Gabon AFCON exit|
|David Beckham returns to PSG|
|Morocco v Ivory Coast: Holders must beat old boss Renard as group reaches thrilling conclusion|
|Djilobodji charged over Fletcher incident|
|Cahill and Terry visit Mason in hospital|
|Allardyce onto second-choice transfer targets|
|Dortmund sign teenager Isak|
|Madrid confirm Modric and Marcelo injury blows|
|Vidal fears longer lay-off, targets return against Arsenal|
|Yaya Toure: Sterling should have dived!|
|Turan wants to see out Barcelona contract despite China talk|
|Impassioned Ibrahimovic attacks Rooney´s critics|
|´He has to lose weight´ – Mihajlovic angry after dropping Maxi Lopez|
|Lack of Liverpool signings frustrates Klopp|
|Suarez: Busquets difficult to replace for Barca|
|Depay impresses Lyon after debut|
|CSL? Rooney committed to United|
|Denis Suarez wants more goals after opening Barca account|
|Simeone bemoans inconsistency but says Atletico are improving|
|Mourinho won´t stand in the way of Rooney and CSL|
|Dzeko on target as Roma stay on Juve´s tail|
|Rakitic ready to cover for injured Busquets|
|Bale and Kane wish Mason well after serious injury|
|Busquets injury less severe than feared - Luis Enrique|