Marco Silva conceded Fulham "cannot switch off for one second" in the Premier League, after Danny Ings' last-gasp equaliser denied the Cottagers all three points against West Ham.
The hosts appeared on course to take the spoils in the London derby at Craven Cottage, where Raul Jimenez put them in front after 24 minutes.
However, the visitors snatched a dramatic equaliser in the fifth minute of stoppage time, when substitute Ings fired past Fulham goalkeeper Bernd Leno.
And Silva acknowledged his side's brief lapse in concentration proved costly.
"It just shows that in this Premier League, you cannot switch off for one second," he told BBC Sport. "We are aware of the quick throws, and we have to keep focus and concentration.
"A big frustration for us because, before that, it was a good performance. It was clear we were the best team on the pitch. They did not have one shot [on target] in the first half.
"We should have won this game. It was not a game where West Ham pushed us back. The goal came after we switched off. It just shows you have to keep focus until the last second."
Silva also felt Fulham should have been awarded a first-half penalty when Adama Traore was challenged by Max Kilman.
"It was a clear, clear, penalty in my opinion," he added. "It's difficult to understand why it was not a penalty in that situation. I don't even want to say anything more about it."
Meanwhile, West Ham boss paid tribute to Ings, who was making only his second Premier League appearance of the season - with both coming as a late substitute.
"It was a very 'Danny Ings' goal!", Lopetegui told West Ham's official website. "He is always agile in those kinds of actions, and he took his chance very well.
"I'm really happy for him, because he hasn't played much up until now, but he is always ready to go. He is a really good example to all of his team-mates, and it's great to see his work pay off.
"As a player, it can be hard when you don't know when the coach is going to call you. The important thing is to try and always be ready, because you are going to be needed at some point.
"Scoring in the last minute today is important, because he's shown everyone that you have to believe until the end. Even though there were things we could do better today, we kept going, and we got something out of the game."
Aston Villa 3-2 Everton: Duran screamer completes comeback for hosts
Jhon Duran’s screamer and Ollie Watkins’ brace completed a stunning comeback for Aston Villa as they fought back to beat Everton 3-2 at Villa Park.
Everton remain without a point in the Premier League this season, despite having gone two goals up in back-to-back matches. Dwight McNeil gave Everton the lead against the run of play on 16 minutes, before turning provider for Dominic Calvert-Lewin’s header 11 minutes later.
The deficit awakened a previously struggling Watkins, who pulled one back before half-time by nodding home a Lucas Digne cross from close range. Watkins added to his tally after the break, tapping in after a mistake from Jack Harrison.
Duran played super-sub yet again, entering the pitch on 69 minutes before firing Villa into the lead seven minutes later with a blistering strike from 30 yards out.
Calvert-Lewin nearly levelled soon after to spoil the party but his shot bounced back off the crossbar.
The victory lifts Villa into third place, only behind Liverpool on goal difference. Everton, meanwhile, remain stuck to the bottom having lost four out of four in the Premier League.
Data Debrief
Everton are now only the second side in Premier League history to lose back-to-back games after leading by two or more goals in both. The other side was their opponents in the last match - Bournemouth (October/November 2022).
It marked the sixth time that Aston Villa have come back from two or more goals in the Premier League.
Now, after just four games of the season, Duran has scored three winners from the bench. No player has scored more winners as a substitute in a single Premier League campaign.
Cooper seeking answers from Premier League after Mateta sucker punch
Leicester City manager Steve Cooper wants the Premier League to provide clear evidence as to why Jean Philippe Mateta's first goal was given in their 2-2 draw with Crystal Palace.
Mateta netted a brace to deny Leicester their first win of the season, but his first goal was originally flagged as offside before it was overturned after a VAR review.
Cooper's side had performed brilliantly to take a two-goal advantage up to that point, with goals from Jamie Vardy and Stephy Mavididi putting them in a comfortable position.
However, the Leicester boss was left with a sour taste in his mouth, confirming he wants greater clarity on why Palace's first goal was awarded.
"I really want to see the image that says that was definitely onside because at the moment we have a few questions to ask of the Premier League," Cooper said.
He wanted to take the positives from the encounter, but could not deny that the late Mateta equaliser from the penalty spot was a painful one to take.
"There's definitely loads of good in the game, but if I'm being honest, it feels like a loss," Cooper added.
"Sometimes a point away from home ends up being really important, it might not feel like it at the moment, but it might be.
"We just needed to manage those moments after going 2-0 up, which we didn't quite do."
Palace boss Oliver Glasner was also disappointed to only pick up a point but praised their character after coming back from two goals down to avoid a third loss in their opening four league matches.
Glasner said: "We are not happy with the point, but I'm really pleased and delighted with the spirit and the character of the players again.
"With the great support from the stand, we had a very good belief today, and with a great impact also from our subs, and let's say all this together, keeping the belief, having a great support from the stand, and having a good impact from our subs. Then we came back. I think it's a compliment for the team for this comeback."
The Austrian was also pleased with his two debutants, Maxence Lacroix and Eddie Nketiah, with both featuring for the entirety of the match.
“Maxence was solid, and also we could see that it was his first competitive game for a very long time in some parts, but he was solid," said Glasner.
"Eddie showed what he showed during training, what we expected from him: he always can threaten the goals.
"He was a little bit unlucky with the two or three finishes he had, but he had good movements, and also before the very important penalty, he made this run and blocked the defender."
Rodgers pleased with Engles debut as Celtic continue perfect start
Brendan Rodgers was encouraged by Arne Engels' debut after he scored from the penalty spot to continue Celtic's perfect start to the Scottish Premiership season with a 2-0 victory over Hearts.
After dominating the opening exchanges, the hosts were offered the chance to take the lead from 12 yards early in the second half.
Nicolas Kuhn's cross was blocked by the hand of James Penrice, with Engels making no mistake from the spot to net his first Celtic goal since his switch from Augsburg.
Luke McCowan confirmed the triumph in the 89th minute, also scoring his first goal for the club, with Rodgers pleased with the pair, but showering particular praise on Engels.
"He's here playing in the eight position," Rodgers said. "He's here with legs and energy and power, he should be able to score goals for us. A good performance from him."
But the encounter could have taken on a much different complexion after the visitors were awarded a penalty of their own in the first half.
Lawrence Shankland's header came off Liam Scales' arm, only for VAR to overturn the decision, and Rodgers believed the right call was eventually made.
"When the referee gives it, it’s always going to be looked at," Rodgers said.
"The ball hits Liam Scales up towards the shoulder on that sleeve part and that’s not a penalty. By the rule, the officials were correct."
Rodgers' side are top of the table with 15 points, ahead of Aberdeen on goal difference, and return to Champions League action on Wednesday when they welcome Slovan Bratislava to Celtic Park in their opening match of the competition.
SportsMax is the Caribbean sports channel of choice, committed to providing sporting content of the highest quality to the Caribbean, delivered by a team of highly innovative, passionate and qualified professionals.
(876) 619-7629
digitalmedia@sportsmax.tv
