Mott joked that he had been told by Lanning in no uncertain terms that the world class batter would be fit for Sunday's warm-up match against England at Antigua after missing their last T20 against Pakistan in Malaysia last week.

Australia start their World T20 campaign against Pakistan at Guyana on November 9.

"She said to me 'I am not missing another game'," national head coach Mott laughed when asked about Lanning.

"She has played through pain before but I think it is settling down.

"It was a minor back issue and a bit of flying (to West Indies) ironically seems to have settled it back down - she is fine."

Lanning returned for Australia's first training session in Antigua on Saturday ahead of their two warm-up matches against England and South Africa in Guyana.

Lanning will be first picked for Australia but Mott admitted selectors faced a tough task ahead of their World T20 opener.

The most difficult call may be over their bowling attack after left-arm spinner Jess Jonassen made a successful return from a knee injury in their series sweep of Pakistan in Malaysia.

The veteran may ensure one of Australia's young brigade of spinners - Sophie Molineux, Ashleigh Gardner or leggie Georgia Wareham - will miss out.

"It'll be an incredibly hard decision, everyone who played has justified their selection," Mott said.

"But that's the beauty of good teams, you have to make some hard calls and I think our players are really understanding of that.

"To be honest, it could be a game-by-game decision depending on who we're up against ... it's a pretty fluid line-up."

Australian Associated Press