(Reuters) -Australia's top supermarket chains Woolworths and Coles said on Monday they could incur millions in additional remediation costs following the federal court's decision on historical underpayments to staff.

Woolworths expects A$180 million ($117.9 million)-A$330 million in post-tax charge, while Coles estimates A$150 million-A$250 million in remediation bill, the firms said in separate statements.

($1 = A$1.5263)