Diego Simeone has accepted responsibility for the dramatic late loss at Villarreal that leaves Atletico Madrid's LaLiga title hopes hanging by a thread.
Antoine Griezmann's controversial penalty looked to have given Atletico a 1-0 win to cut Barcelona's lead at the top of the table to eight points.
But after Greizmann was substituted, having missed a great chance to seal the points, Unal stuck twice in the last 10 minutes to snatch victory for the hosts.
Simeone's options were restricted by injuries to full-backs Juanfran and Filipe Luis, who broke his leg in Thursday's Europa League win over Lokomotiv Moscow.
But bringing on Vitolo for Angel Correa backfired - the winger was sent off in injury-time after a clash with Nicola Sansone - while the decision to gamble by introducing striker Fernando Torres for Koke with the score at 1-1 left Atleti overrun.
Unal stole in unmarked at the back post to extend Atleti's winless run against Villarreal to six matches and Simeone took the blame.
"I have the feeling that I lost the game myself," Simeone said.
"The players made a huge effort and I could not help them with my decisions. I may have been wrong.
"It was an intense match with similar characteristics in both teams, we made a good first half and we were handling it well in the second and they took advantage of those two actions.
"The details caused the match to fall on their side in such a close game."
THAT FEELING ! pic.twitter.com/7kp88sQNyO— Villarreal CF (@VillarrealCF) March 18, 2018
Atletico were on track to win their 12th game in 13 matches in all competitions before their late collapse, a narrow defeat at Barcelona the only result blotting their recent form.
But even though a 2-1 loss at Villarreal leaves his side 11 points behind Barca with only nine games to play, Simeone is not yet ready to give up hope.
"We are still on the same line, trying to do as much as possible," Simeone said.
"We did many good things, others bad, but we still think about adding many points.
"We have to add many points and we will see in the last five days where we are."
While Simeone held his hands up regarding tactical decisions, Saul Niguez blamed Atletico's defending of set-pieces for their loss.
"We have no explanation, they have taken advantage of the fact that they have not defended well those two set plays, today we started well but two tactical errors cost us the game," Saul told beIN SPORTS.
"Their set pieces are different, they are strong in that aspect and they have beaten us with them.
"We should not think about the league, but focus on our matches and do things right."
19 de septiembre 2018
|Liverpool ´made a point´ with PSG victory - Gomez|
|Osaka wows Tokyo crowd on WTA return|
|Excited Povetkin arrives in England for Joshua showdown|
|Kovac patience with Sanches set to reap rewards|
|Kovac: Madrid strong without Ronaldo, Messi is the best|
|ATP suspends umpire Lahyani over Kyrgios ´pep talk´ at US Open|
|North and South Korea seek to co-host 2032 Olympics|
|Ampadu signs long-term Chelsea contract|
|Don´t blame Neymar, PSG players all guilty - Thiago Silva|
|Real Madrid seek to plug Ronaldo scoring gap – Champions League in Opta numbers|
|Brewers allow Cardinals to inch closer with loss to Reds|
|Manchester is still red – Depay ahead of Lyon´s clash with City|
|Orioles become first pro team to wear braille jerseys|
|Klopp hails ´brilliant´ Henderson|
|PSG attack lacked aggression, says Tuchel|
|Atletico Tucuman 0 Gremio 2: Libertadores holders draw first blood in QFs|
|Thomas plays down wrist worry|
|Rakitic wants more from Barcelona hat-trick hero Messi|
|My players aren´t s*** – Pochettino defends Spurs squad|
|Cubs reliever Morrow won´t return this season|
|Tebow expected to be back in Mets organisation next season|
|Inter can compete against anyone – Icardi revels in Champions League victory|
|Tuchel: PSG loss to Liverpool not logical or correct|
|Sturridge in best shape I´ve seen – Klopp|
|Milojevic celebrates ´fantastic´ occasion after Red Star´s 26-year wait|
|Rodrigo and Simeone salute Griezmann display|
|Seahawks DE Clark on Bears QB Trubisky: He´s nothing special|
|Carroll says Wilson has been ´over-trying a little bit´|
|Judge returns to Yankees´ starting lineup|
|Napoli boss Ancelotti takes aim at Red Star time wasting|
|Favre admits young Dortmund stars struggled in Bruges|
|Otavio would trade goal for Porto victory as he bemoans Schalke draw|
|Championship Review: Pacesetters Leeds crush Preston, Villa end five-game winless run|
|Neymar world-class but not a defender - Klopp says Liverpool targeted PSG star|
|Waiters injury update: Heat guard unlikely to be ready for start of season|
18 de septiembre 2018
|Gojowczyk eliminates returning Tsonga in Metz|
|Liverpool enjoying best start in 57 years after PSG win|
|Galatasaray 3 Lokomotiv Moscow 0: Terim´s side make light work of Russians|
|Club Brugge 0 Borussia Dortmund 1: Super sub Pulisic scores late winner|
|Schalke 1 Porto 1: Fahrmann saves one penalty, but Otavio scores another|
|Red Star Belgrade 0 Napoli 0: Points shared as Italians fail to make possession pay|
|Liverpool 3 Paris Saint-Germain 2: Firmino strikes late as Reds edge five-goal thriller|
|Monaco 1 Atletico Madrid 2: Costa and Gimenez seal comfortable win|
|Chaos reigns in Serie B as league denies suspension claim|
|India secure Asia Cup victory despite valiant Hong Kong effort|
|Messi makes "extraordinary routine", says Valverde after Barca star surpasses Ronaldo|
|Spalletti´s Inter to take heart from Tottenham turnaround|
|Casillas features in landmark 20th Champions League campaign|
|Spurs deserved more from best performance of the season - Pochettino|
|Brown absent from Steelers facility on Monday due to ´personal matter´|
|Toronto´s Bussey given eight-match biting ban|
|Barcelona 4 PSV 0: Marvellous Messi lights up Camp Nou|
|Inter 2 Tottenham 1: Icardi, Vecino complete dramatic late turnaround|
|Allegri, Chiellini defend Costa over spitting ban|
|Firmino only fit enough for bench duty|
|Kovac applauds Sanches ahead of Benfica homecoming|
|Tomlin confirms Steelers WR Brown was absent from facility on Monday|
|Mourinho tells United to follow Federer´s lead amid Young Boys pitch concerns|
|Costa banned for four Serie A matches for spitting|
|PGA Tour announces changes to FedEx Cup Playoffs format|
|Rashford to start against Young Boys, Mourinho confirms|
|Ryder Cup heading to Congressional in 2036|
|I never listen to stupid things - De Gea unconcerned by criticism|
|Aguero trains as Mendy sits out Man City session|
|Lampard fined after accepting improper conduct charge|
|Serie B suspended after Pro Vercelli win appeal|
|Mitchell returns to England as defence coach|
|Brady completes Cornet upset in Guangzhou|
|Lopetegui giving no guarantees to ´fighter´ Navas|
|Di Francesco denies racially abusing Costa|