He remains in serious doubt for the World Cup, with Clarke fearful it could be even more serious than that.
"There's a chance I may never play again," he said, noting Cricket Australia was in dialogue with experts about the best way to treat the latest tear.
Lehmann's gut feel was Clarke would lead Australia once more.
"I think he will be back. You have your fingers crossed, we will wait and see," he said.
Whenever Clarke is next on the cusp of a recall, it won't be a straightforward fitness test.
Lehmann and fellow selectors must weigh up not only Clarke's current state of health, but the risk his chronic back or hamstring woes could flare up at any moment.
Both incidents in the first Test were incredibly innocuous.
Team physio Alex Kountouris, speaking last month as Clarke raced the clock to play the first Test, admitted it was a hard issue to manage.
"Once he's done it once, twice, the risks go up of a recurrence. How we minimise those risks is difficult," Kountouris said, then analysing Clarke's left hamstring injury.
Lehmann was reluctant to discuss Clarke's World Cup equation too much on Sunday.
"He needs to get it right. He knows that, we know that," Lehmann said.
"One-day cricket is an explosive game and we need guys fully fit, all the time."
Lehmann has already consulted the World Cup rulebook, confirming Australia could replace Clarke in their squad if he re-injures his back or hamstring during the tournament.
National selectors would presumably want Clarke to return during the group stage, ensuring he has a few games under his belt before the knockout fixtures.
"You need to score runs to be in the team," Clarke said of his World Cup hopes.
"I play my best cricket when I get some momentum."
