Shock jock Kyle Sandilands has been suspended by 2Day FM for his comments that Magda Szubanski would lose more weight in a concentration camp.

The suspension is in effect immediately, pending further discussions between Sandilands and Austereo, the owner of 2Day FM.

"2Day FM believes the comments made by Kyle were unacceptable and sincerely apologises and regrets any offence they caused," a statement from Austereo said.