After a disappointing opening group stage loss to South Korea, Greece were not expected to grab all three points against the Nigerians but now they find themselves in a position to reach the second phase of the tournament provided they can defeat Korea in Durban on Tuesday.
Samaras said it was a great moment for Greek football but said that the celebrations would have to wait as they prepare for another vital match.
"We have a very good team and I just try to do my best. We deserved to win because we worked really hard," he said.
"They are an African team with a lot of strength with power and pace. We pushed ourselves to the limit.
"This is a good moment for us. I never feel pressure. I am positive about football, every single day, every single minute.
"We want to enjoy it but there is not time for celebration.
"We have a flight back to Durban in the morning and then training. We have only four days to prepare for the next game (against Argentina)."