Fulham were left fuming as they believed that Liverpool did not deserve to win through a controversial penalty.
The Reds beat the Cottagers 1-0 thanks to a Mohamed Salah spot kick on Wednesday night.
However, midfielder Tom Cairney believes that his teammate Issa Diop was unfairly punished for a coming together with Uruguayan striker Darwin Nunez.
“I thought we played very well at times, but to lose to a penalty that wasn't a penalty is always a kick in the you-know-whats," Cairney told the official Fulham website.
"At the time, I wasn't sure. The ref made a decision, I thought he'd seen contact.
“I asked him on the pitch, 'please just make sure they check it.' He said they checked it."
Cairney added: "He said second half to one of our players that it wasn't a penalty, so it's frustrating because it goes to other people to make the correct decision. Issa Diop hasn't touched him, Nunez has taken another step and then gone over, and then you lose to something like that at Anfield which is frustrating when we're trying to climb as high as we can."