Rangers manager Walter Smith admits he was disappointed by the reaction of some of his players at the end of Wednesday's Old Firm derby.
Madjid Bougherra was sent off in injury-time and El-Hadji Diouf was shown a red card following the final whistle, after Steven Whittaker was dismissed in the first half at Celtic Park.
Smith acknowledges it is now his responsibility to ensure the discipline improves ahead of the Co-operative Insurance Cup final between the two clubs on March 20.
He said: "I was a little disappointed with the reaction of some of the players to decisions later in the game. They did get a little frustrated. You can argue about the right or wrong decisions of the referee but our reaction towards the end was a wrong one.
"That's something I have a responsibility to try to rectify. I don't hide away from that, that's part of management. I've got to take responsibility for that and will try to do so."