The German Grand Prix has already dropped off the 2017 calendar, and while it will return in 2018, the event's future remains uncertain, according to Hockenheim chief Georg Seiler.
Hockenheim and Nurburgring entered into an agreement in 2007 to share hosting duties of the German Grand Prix, but the past two races (2015 and 2017) at the latter circuit have been cancelled due to financial problems, leaving Hockenheim as the sole host.
The circuit currently has a contract to continue with its bi-annual deal until 2018, but after that its future is "at risk", with Seiler admitting Hockenheim, which has struggled to attract spectators in recent years, needs more beneficial conditions to extend the deal.
"We will not conclude a [new] contract for the future that involves any risks," Seiler told Germany's DPA news agency.
"From an economic point of view, we had to accept losses through Formula 1, which had a significant impact on our results in recent years.
"We also do not get a single euro of subsidy from the region, country, federation or anyone else, unlike just about every other race track," he added.
When asked if there will still be a German GP at Hockenheim after 2018, he replied: "For me it's clear. We have a contract for next year, but after that not.
"If we follow the previous rule, in 2019 it would be the Nurburgring's turn and us in 2020 again. But only if the contract fits.
"If the basic conditions do not change, the future of Formula 1 in Germany is certainly at risk. If we can at least break even, that would be alright. But if there is no more F1, then so be it."
Seiler is counting on new owners Liberty Media recognising the importance of a race in Germany when it comes to discussing a new deal.
"I hope and firmly believe that the new owners have an interest in having a German Grand Prix," he said. "Germany is an important market for Formula 1, no matter what circuit it takes place at."
