Organisers hope that up to 35,000 runners can take part in the Berlin marathon this September as part of a pilot project as Germany eases Covid-19 restrictions.
In a joint press conference Monday, Berlin's senate and marathon organisers outlined plans to first hold two test events, a 10km race in July and a half marathon in August.
Providing all goes well and the rate of infection remains low, the Berlin marathon would take place on September 26.
Runners would either have to prove they are fully innoculated or undergo a PCR test as part of a hygiene programme still to be approved by Berlin's health authority.
"There is no certainty that the Berlin Marathon can take place, but the probability is there," said Berlin senator Andreas Geise.
"If the incidence rates continue to fall, approval of the pilot project is conceivable."
A maximum field of 35,000 would be 10,000 down on the 45,000 who took part in the 2019 Berlin marathon, the last one before the 2020 race was cancelled due to the pandemic.
The official world record for the men's marathon was set in Berlin in 2018 when Kenya's Eliud Kipchoge ran the 42.195kms (26.2mi) in two hours, 1:39 minutes.
The top three fastest race times for the men's marathon have all been run in Berlin.