'We do not need foreign ground combat forces on Iraqi land,' Abadi said in a statement, Reuters reported.
US Defense Secretary Ash Carter offered few details on the new 'expeditionary' group, but said it would be larger than the roughly 50 US special operations troops being sent to Syria to fight there.
A US defense official, speaking on condition of anonymity, said the new force would be based in Iraq.
Abadi later issued a statement saying the Iraqi government 'stresses that any military operation or the deployment of any foreign forces - special or not - in any place in Iraq cannot happen without its approval and coordination and full respect of Iraqi sovereignty.'