Liverpool manager Jurgen Klopp has accused Brentford of "stretching the rules" following the Reds' Premier League defeat on Monday night.
The Bees secured a 3-1 win over the Merseyside club courtesy of an Ibrahima Konate own goal and strikes from Yoane Wissa and Bryan Mbeumo.
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Alex Oxlade-Chamberlain cut the deficit early in the second half, but his effort would only be a consolation goal.
Despite scoring three times in the clash, Brentford could easily got another two goals as Wissa saw two of his strikes being disallowed for offside.
Thomas Frank's side has now climbed up the table to seventh position, two points behind the 2018/19 UEFA Champions League winners.
In a post-match interview, Klopp was critical of how the match officials managed the Premier League tie.
"We played here last year and it was 3-3, and it's a very similar game, a wild game, a game Brentford wants," the 55-year-old said, per Sky Sports.
"I'm not sure you can really control it all the time because each corner is a massive threat. They stretch the rules in these moments, full-body contact.
"There was only one offensive foul off a set-piece tonight which was whistled and it was against us, which is really funny!
"Of course, we don't behave perfectly but, like I said, they stretch the rules in these moments.
"They're really pushing, really holding and everything. That's why it's really difficult.
"I wish we could have done better there.
"We had a meeting before the season where they told us the refs will whistle that but unfortunately they don't do it.
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"A foul is a foul, holding is holding, pushing is pushing.
"If the refs see it, you would expect them to whistle it. If they don't see it, they can't whistle it, and that's how it is."
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WATCH: JURGEN KLOPP CLAIMS THAT HIS SIDE FAILED TO HANDLE BRENTFORD