Spin-bowling great Shane Warne was among the former players who questioned decision to include wicketkeeper Tim Paine, while the inclusion of veteran batsman Shaun Marsh also raised a few eyebrows.
Speaking in Brisbane, where the series gets underway at the Gabba on Thursday, Lehmann justified the selections and called for the whole country to support the team.
"Everyone is entitled to their opinion, aren't they?" he said.
"I'd just like all our players, ex-players, to be really positive about the Australian cricket team. Let's just get everyone from Australia behind the Australian cricket team and let's get moving forward."
Paine, who played the last of his four tests seven years ago, was the most controversial selection mainly because he does not even keep wickets for his state Tasmania.
"We've watched him keep a fair bit," Lehmann added. "He's a high quality keeper.
"He's been in good form with the gloves, as he always has been, and he has been very good for us in the T20s."
Few players are more divisive in Australia than 34-year-old Marsh, who looks likely to fill the number six slot in the batting order on his eighth recall to the test side.
"He's in good form, so he'll do well," Lehmann added. "He's pretty calm.
"He's grown up a lot in the last few years and played some important knocks for us. He's really confident within himself."
Lehmann said also said Australia would not be distracted by reports from England that suspended all-rounder Ben Stokes could be cleared to play a part in the series by police this week.
Vice captain Stokes has been suspended since being arrested on suspicion of causing actual bodily harm outside a Bristol nightclub in September.
A report in Britain's Daily Telegraph said that police would make a decision over whether to charge Stokes this week, potentially leaving him clear to join the England squad before the second test in Adelaide.
"We can't worry about it at the moment," Lehmann said. "For us it's more of a case of dealing with the squad they've got here."
(Reporting by Nick Mulvenney; Editing by John O'Brien)
