German football is planning to return on May 9 and become the first major European league to resume since the outbreak of coronavirus.
And Lehmann says a stadium at 25 per cent capacity is a realistic option as they look to protect the economy.
"Anyone who violates the distance rule is kicked out and is banned from the stadium. In general, I think Mr Schauble's [president of the Bundestag] statements are good: we have to start Germany up again so that the economy survives.
"That applies to all sectors of the economy, including the Bundesliga."
Lehmann himself contracted coronavirus but claimed it was "easier than the flu" to deal with.
He added: "Yes, I became infected in mid-March and suffered from a cough and mild fever for a day and a half.
"After two weeks of quarantine, the authorities declared me healthy again. It was easier than with flu. But of course people at risk have to be careful. It probably also helps to live reasonably healthy."