Scores of 10 and three during Australia eight-wicket defeat by England in the third Test at Edgbaston -- a result that saw the tourists go 2-1 behind in the five-match Ashes campaign, left Clarke with a meagre series aggregate of 94 runs in six innings at an average of under 19.
Following a match that was all over inside three days of a scheduled five, Clarke confronted his own failings by suggesting Australia were playing with 10 men.
Indeed his average slipped to below 50 after this Test for the first time in three years.
And having been plagued by a longstanding back complaint, as well as more recent hamstring trouble, there has been speculation this could be the 34-year-old's last tour.
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But Lehmann believes the class that has seen Clarke score 28 Test hundreds has not deserted his skipper.
"He'll get as long as he needs, he's captain," Lehmann said after Friday's quickfire defeat.
Adam Voges, however, is unlikely to receive similarly unequivocal backing ahead of next week's fourth Test at Trent Bridge.
For all that he scored a debut hundred in the West Indies recently and has vast experience of English conditions due to time spent playing county cricket, the 35-year-old Voges's average for the Ashes after three Tests stands at 14.60.
Now his place could well be in jeopardy when on-tour selector Rodney Marsh and Lehmann come to pick their side for Trent Bridge.
"It's a disappointing game for us and we've just got to cop the criticism we cop and get back on and work out what the best XI is to win the next Test match."
Meanwhile Lehmann said leaving out Brad Haddin from the team that played at Edgbaston was the hardest decision of his career, amid accusations it made a mockery of Australia's 'family first' policy.