Liverpool manager Rafa Benitez felt his side were denied a 'very clear' penalty in their 1-0 loss to Arsenal on Wednesday.
The Reds found themselves trailing after Abou Diaby headed the Gunners in front late in the second period.
But in the final seconds of the match Steven Gerrard saw a free-kick connect with Cesc Fabregas' hand, as the Spaniard stood in the Arsenal wall.
Liverpool strongly appealed for at least a free-kick, with Fabregas positioned around on or near the18-yard line, but referee Howard Webb waved away appeals.
Asked whether he felt his side should have been awarded a penalty, Benitez told Sky Sports: "I think so. I think that it was very clear.
"The referee said to our players to be careful and not put your hands too high. It was unbelievable to see the replay and how he could not see it.
"I think we have to analyse the game on not just one decision. Clearly it was a mistake, but the game was difficult against a good team.
"I think in the second half we were pushing and could have got at least a point."