"As a professional you've got a responsibility to conduct yourself in a certain manner," said Dalglish.
"Not just on a Saturday night because when they were sitting on the bench in front of all the cameras, they've got a responsibility of how to behave.
"After what they did sitting on the bench something had to be done. It's a great credit to Rangers.
"They were punished for the Saturday night and that's where it should have finished. But they carried it on to Wednesday. I think Walter Smith as (Rangers) manager is dignified and supportive of his players and it's a disappointment for him.
"Not only have they let themselves down, they've let Scotland and more importantly their employers down and I think Walter had no option but to take action.
"The boys have just got to accept it."