Gerrard felt they were denied a clear penalty when his free kick hit Cesc Fabregas’ hand in stoppage time.
“The referee told the Liverpool wall in the first half that if anyone raises their arms above their waist he was going to give a penalty,” said the England midfielder.
“So for some crazy reason he didn’t give it. He told me after the game he hadn’t seen it.
“It was unbelievable and I can’t believe he didn’t see someone raise their hands in the wall.
“We know over the course of a season sometimes you will get decisions and sometimes you won’t, but something so clear as that was hard to take, especially with the referee being Howard Webb.
“I would say he is one of the best referees in the league so I am very surprised he didn’t see it.”