"We have a Constitution and it does not allow foreign judges to operate in the country," Fonseka, now the Cabinet Minister of Provincial Development told reporters today.
"It will be a domestic mechanism but we are not averse to obtaining foreign expertise as appropriate," Fonseka said.
Tamil rights groups have accused Fonseka and his troops for gross rights abuses during the final phase of the conflict they ended in 2009.
The Tamil political groups also demand international judges in war crimes probe claiming that Sri Lankan judiciary had historically failed to deliver justice.