The Greek defence minister has said Greece could turn to the US, Russia or China if it fails to reach a new debt agreement with the eurozone.
Panos Kammenos, who heads the junior coalition partner Independent Greeks, said Greece had an obligation to go to "plan B" if proposals are rejected.
Greece is preparing to plead its case for a new deal at a meeting of eurozone finance ministers on Wednesday.
It says the terms of its €240bn (£182bn) bailout are too severe.
Last month's election of an anti-austerity government led by left-wing Prime Minister Alexis Tsipras has raised fears that Greece could leave the euro.
EU officials have so far rejected his efforts to renegotiate bailout terms, although German Chancellor Angela Merkel has said she will wait to see if Greece puts forward "a sustainable proposal" on Wednesday.
I'm going to paint you a crazy picture... there's probably no chance this will happen but you never know, crazier things have happened.
Russia (or China) comes to Greece and says hey... I'll tell you what.
We'll give you an extremely favorable deal on your debt, we'll alleviate all this crap for you but we ask one thing in return, a Naval/air base on your territory...
Now there are huge roadblocks ahead, being the fact that Greece is a part of NATO.
But if this Greek Government is desperate enough... there's no telling how far they'll go.