The home side is under tremendous emotional stress following Hughes' death after being hit by a bouncer during a domestic game.
The entire squad attended the batsman's funeral in his hometown of Macksville and skipper Michael Clarke broke down while reading out his tribute to the player he called his little brother. The distressed squad flew to Adelaide today for the opening match against India starting December 9.
"We want to hold his values close to our heart and that means playing cricket the way he did, with a love of the game and a smile. It's going to be hard and if somebody is struggling Michael and I understand. There is no pressure on them," he added.
Lehmann said those who choose not to play would be cared for.
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Meanwhile, former Australia captain Mark Taylor said the best way to honour Hughes' memory is to play the Test.
"I also think it's going to be difficult for them to move on and I think until they start playing cricket again they won't actually move on," Taylor said.
"So I think it will be part of the healing process when they do play in Adelaide next Tuesday.