The Greek actress plays a love interest to Daniel Craig's super-spy character in the 23rd Bond movie.
Sotiropoulou said that due to strict secrecy protocols, she did not know what she was doing on set until the time came to shoot her scenes, reported Contactmusic.
"I was one of the people who never had a script. I just got told what I'd be doing on the set by the director. They have to be so careful. You have quite strict contracts that say you can't say anything about the plot. And everyone respects that," she said.
"Skyfall" will release October 26.