Western Australia coach Langer has long been favoured to take over the top job eventually and Lehmann said the June tour would give the former test batsman some valuable experience while giving himself a break from the rigours of the job.
"He's in charge. I won't be saying what he can and can't do," Lehmann told reporters at the Melbourne Cricket Ground where Australia are playing West Indies in the second test.
"He'll bring his own ideas and I think that's good for the players, having some fresh ideas occasionally.
"It's just a chance to get JL into the system and let him have the reins for a trip ... He'll do a great job."
Australia will play South Africa and West Indies in the 10-match tournament starting June 6 in Guyana. The final will be played in Barbados on June 26.
Lehmann said he had no plans to retire any time soon and hoped to guide the team to victory in the Ashes in England in 2019.
Australia lost the Ashes 3-2 in England earlier this year after being favoured to win.
"We let ourselves down this year. 2013 was a different scenario, we were changing the whole setup," he said.
"I'd love to have another crack at that. But you're guided by results along the way, you can't look that far ahead."
With Australia's batsmen performing well in the 2-0 series win over New Zealand and the current series against West Indies, Lehmann said he felt the batting order in the rebuilding side was settled under new captain Steve Smith.
"The top five is pretty settled," Lehmann told local broadcaster Fox Sports.
"We're really happy with the way the batting group has come together over this summer and made some big runs.
"We obviously play the conditions really well at home.
"But the challenge for the group is to finish the summer off really well and then play that way away from home."
After the Melbourne test, Australia play West Indies in the third and final test in Sydney before heading to New Zealand for two tests in February.
(Editing by Greg Stutchbury)
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