Sky sports pundit Chris Kamara has criticised the match officials at Old Trafford on Saturday, as he claimed Liverpool should have been awarded three penalties.
The Reds fell to a narrow 2-1 defeat to rivals United in the close Premier League contest, but the game was overshadowed by some questionable decisions.
Referee Craig Pawson and his team of officials waved away several appeals for a penalty from the visitors.
Liverpool boss Klopp was unhappy with Marouane Fellaini’s challenge on Sadio Mane, with the Senegalese star going down in the box under pressure from the midfielder late in the second half.
But there were other contentious decisions, with James Milner and Mohamed Salah both potentially fouled by Eric Bailly and Ashley Young respectively either side of half time, before Antonio Valencia handled Andy Robertson’s cross.
Kamara could not believe Liverpool were not given a penalty throughout the 90 minutes, and believed three of the four should have led to Pawson blowing his whistle.
Kamara said, “I’ll go with three. One is dubious, one is in the hands of the referee. You saw at Bournemouth (last week, at Leicester) that you very rarely get two away from home but how he can not give them one in this particular game?
“This first one (Bailly on Milner) – how is that not a penalty? Bailly just comes across now, with his leg across Milner.
“Salah (is the dubious one), he is one of those players who doesn’t go down and wants to stay on his feet. A little bit of a tug.”
But if the ex-defender was unsure of the infringement on Salah, the following two left Kamara in little doubt.
“This one (the Valencia handball), obviously it’s not deliberate,” he added. “We see that but this is always the referee’s interpretation.
“Look at the Liverpool players. To a man, arms up, they know there’s been a handball and they’re hoping the referee comes to it.
“The only thing you would say is that he’s a long way away.
“This one (Fellaini on Mane) is absolutely stonewall.
“There’s no ifs or buts about it. Once you kick somebody in the back of the leg like that, they suffered a few weeks ago in the same situation against Spurs, and so, they would have expected it.
“Three out of four (penalties), for me.”
His assessment was not echoed by former goalkeeper Mark Schwarzer, however.
The Australian told Goals on Sunday that he would have only awarded one penalty – Fellaini’s challenge on Mane.
On the challenge on Milner, he said: “There’s nothing near the ball, there’s contact and down he goes. I was surprised at the time, but no. I thought the ball was going to go out.”
On the handball, he added: “It’s not about whether it’s deliberate or not, it’s more where his hand is.
“Is it in a natural position? It is. To me that’s definitely not a penalty, other ones you can definitely argue.”
But the former Chelsea keeper admitted Mane should have been given a penalty after being felled by the Belgian.
“I don’t think he (Pawson) sees the foot,” he said.
“At the game I didn’t see it – I saw the challenge but couldn’t see if it was a penalty or not, I’m a lot further away than the referee was – but in slow motion, you see that final angle, it definitely should have been an angle.”
Liverpool have been awarded three penalties at Old Trafford before – in the 3-0 victory over United in 2014.
Steven Gerrard converted the first two but missed the third in what remains the Reds’ last win at the stadium.