Jurgen Klopp accused Brentford of "stretching the rules" after Liverpool fell to a shock 3-1 defeat against the Bees on Monday.
An Ibrahima Konate own goal and a Yoane Wissa header put Liverpool two goals down before half-time, as Klopp's side struggled to cope with Brentford's set-piece deliveries.
Liverpool made three changes at the break – including Virgil van Dijk coming off – and the alterations looked to have given the Reds hope when Alex Oxlade-Chamberlain pulled a goal back on his 100th Premier League appearance for the club.
However, Bryan Mbeumo put the game to bed when he muscled Konate off the ball before lashing home late on to give Brentford their first win over Liverpool since 1938.
Klopp was frustrated after a game in which he perceived Brentford to have bent the rules, while he criticised referee Stuart Attwell's failure to take action over their behaviour during set-pieces.
"I'm not sure you can really control it all the time because each corner is a massive threat," Klopp told Sky Sports. "They stretch the rules in these moments with full body contact.
"There was only one offensive foul on a set-piece tonight which was whistled and that was against us, which is really funny. Holding is holding, and pushing is pushing.
"It was more the game they wanted than the one we wanted. They could dictate it because of how it got whistled.
"The two corners they scored with, one was offside and the other one, of course we don't behave perfectly, but they stretch rules. They are really pushing, they are really holding. That's obviously what you can do.
"The third goal I can really not respect. The ref thought it wasn't a foul and then VAR hides behind the phrase 'clear and obvious'. The referee has to explain that, if anybody could ask him.
"There's a reason why they are so successful with offensive set-pieces and still concede a lot of defensive goals around set-pieces, because there you cannot do the same stuff because in your own box, it would be a penalty."
While Klopp was angered by the officiating, he did not excuse his team from criticism, saying: "We have to point at ourselves. In the end, you don't lose a game if you do everything right. We did, for sure, not everything right.
"We are very critical of ourselves, and rightly so tonight. There were moments where we could have changed the game."
Darwin Nunez missed a golden opportunity to give Liverpool an early lead, rounding David Raya only to be denied by Ben Mee's goal-line block. No player has missed more big chances in the Premier League this season than Nunez's 15.
Klopp lamented his side's wastefulness in front of goal, adding: "We concede the first goal when we should already be 2-0 up, with super chances from Darwin and from Kostas [Tsimikas]. Darwin Nunez doesn't expect Ben Mee sliding there.
"In the next situation, they play a ball behind the line and we are not there, that's a massive point for criticism."
Under-fire Stefano Pioli respects Milan fan protests
Stefano Pioli said he respects the opinions of Milan's supporters after thousands of fans carried out a silent protest during Sunday's 3-3 Serie A draw against Genoa at San Siro.
With Milan enduring a second straight trophyless season, trailing champions Inter by 18 points, Pioli has come under pressure amid suggestions the Rossoneri have held talks with former Spain and Real Madrid boss Julen Lopetegui.
Irritated fans unfurled banners demanding improvements to the team during Sunday's match, while the club's ultras stayed silent in protest throughout the game.
Fans then left behind a banner which read "the sound of silence" as they filed out en masse from the Curva Sud shortly after Olivier Giroud had put Milan 3-2 ahead in the 75th minute.
By the time Genoa pulled level late in the match, thanks to an own goal by Malick Thiaw, the stand was completely empty.
"The fans have chosen this type of protest and we just need to respect them," Pioli, whose side have already secured their spot in next season's Champions League, said.
"Our fans have been an added value in recent years. They will have their reasons if they chose this protest."
Sunday's draw also means Milan are winless in their last four league matches.
"The start was poor. We didn't have the proper concentration and unity in the opening 20 minutes and conceded an early opener," Pioli said.
"Then, we created many opportunities but also made many errors. It's a shame we didn't win because it would have been important for the table."
Alonso says Leverkusen can still improve as unbeaten run reaches 48 games
Xabi Alonso believes his Bayer Leverkusen side can still improve after they extended their unbeaten run to 48 matches across all competitions on Sunday, equalling Benfica's European record.
Champions Leverkusen thrashed Eintracht Frankfurt 5-1 in the Bundesliga to match Benfica's 48-game unbeaten run between 1963 and 1965 – a record across all competitions in Europe.
Alonso, however, still feels there is more to come.
"Our level, our consistency throughout the season is great. But we are always moving forward. We are always concentrating on the work and improving," he said.
Leverkusen, who are edging closer to an unbeaten season across all competitions, have two league matches remaining and are also set to face Kaiserslautern in the DFB-Pokal final on May 25.
They also hold a 2-0 lead over Roma at the halfway stage of their Europa League semi-final tie, with Thursday's second leg offering them the chance to surpass Benfica's record on home soil.
"It's a big challenge, we have two [Bundesliga] games left, it will be the perfect run. We will certainly try," Alonso said.
"We still have games to play to achieve our big goals in all competitions. The next game is important for us, the second leg of the Europa League semi-final: a chance to reach the final.
"In football it's sometimes difficult to stop. You have to prepare for the next game. The next game is a big game for us. Hopefully we have the chance to be in a European final again."
Leverkusen will play Bochum and Augsburg in their final two Bundesliga games.
Should they progress to the Europa League final, they will then face either Atalanta or Marseille in Dublin on May 22, three days before the DFB-Pokal showpiece game.
Postecoglou: Spurs have a confidence problem to overcome
Ange Postecoglou says that Tottenham need to "overcome" their low confidence after suffering a 4-2 defeat to Liverpool on Sunday.
Spurs slipped to their fourth consecutive Premier League defeat, being left to bemoan their slow start as they found themselves 4-0 down by the hour mark thanks to goals from Mohamed Salah, Andrew Robertson, Cody Gakpo and Harvey Elliott.
Richarlison came off the bench to salvage some pride for Spurs, scoring one before setting up Son Heung-min for a goal on his 300th Premier League appearance.
Spurs had the opportunity to cut the gap to the top four after Aston Villa’s defeat to Brighton, but they remain seven points off a Champions League spot.
Postecoglou’s side still have a game in hand over the Villans, though he was sure that Spurs would be able to put their recent poor run behind them.
Asked if Spurs had a confidence problem, Postecoglou told Sky Sports: "Maybe in the front third there is.
"It probably is a bit of a lack of confidence, but again, that's something the guys have to work through.
"You have to find a way to overcome that because, ultimately, if you don't put pressure on the opposition in the front third after you've worked your way up there, they're going to get comfortable with their position."
Spurs have won just one of their last nine Premier League away games, failing to win any of the last five.
Despite that run extending at Anfield, Postecoglou highlighted what he thought was an improvement on their recent performances.
He continued: "Obviously a hugely disappointing outcome for us but at least we were more like ourselves today in terms of our football.
"Our last two away games at Newcastle and Chelsea, apart from the results which weren't great either, we just didn't try and play our football.
"I thought today, even in the first half, some of our football, our pressing was back to where it should be."
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