Anton told Curbs that he was visiting his Grandmother on the Isle of Wight however the under-fire defender decided to go to the States on a boozy birthday bash.
Speaking after the Hammers' gut-wrenching defeat to Tottenham yesterday Curbs said, "I didn't find out about the Anton Ferdinand situation until Saturday, but I had picked my team to face Tottenham and we had trained hard all week," said Curbishley.
"But it is not what you want and you want to be talking about football.
"I have spoken to him briefly, he has apologised and we will take it from there.
"The players were all told they could not leave the country and he will clearly be disciplined.
"We have changed the structure and the fines are now heavier than they were.
"There is so much negativity surrounding us at the moment and I understand that because of the predicament that we find ourselves in. But it is affecting the players.
"Every day there seems to be something different and I don't hear about it from the other 19 clubs in the Premiership at the moment. It is one-way traffic."