Lehmann acknowledged that England would start the series as favorites following Australia’s troubles under Arthur, including a 4-0 series loss in India earlier this year.
However, he insisted that an Australia side written off in some quarters as the “worst to tour England for 30 years” would be competitive.
“We deserve to be underdogs, to be fair,” said Lehmann, who knows English cricket well from his time as a player with Yorkshire.
“England have been pretty good for a long period of time. We have to play our best, we know that, but it’ll be a tighter series than everyone thinks, I reckon,” he added.