Sania Mirza and Rohan Bopanna enjoyed success at the previous eight-nation Hopman Cup, beating Croatia and the Czech Republic in the group stage before losing to Spain in the semi-finals.
They had qualified for that tournament by winning the inaugural Asian Hopman Cup, but McNamee said he had invited them directly into the main field this time around.
"It's just reward for their challenge last year and for Sania's considerable progress this year," McNamee said.
India join Serbia, the Czech Republic and France as confirmed starters.