Swiss defender Philipp Degen and Jamie Carragher were both sent off in the late stages of their 3-1 defeat at Fulham.
He fumed: “They were two incidents in a few minutes when we were losing and they were difficult to take.
“The first one was a yellow card. The second one you can clearly see that Carragher was kicking the ball.”
He added: “It’s hard to take the defeat, especially when we were in control of the game. The first half was one-sided. We made one mistake and we conceded a goal.
“The second half they were more offensive and we made a massive mistake when we conceded the second goal.
“We worked hard with nine players but it was very difficult.”
