The quirky film was such a hit in the Far East that Japanese film bosses decided to revamp it with local actors, actresses and settings.
And they asked Giamatti to be a part of the production.
The actor says, "They asked me to be in it, actually... I don't know what I was going to play.
"I said no. I felt my career hasn't hit that low yet. I thought, 'What am I gonna play - the sushi chef or something?'"
Giamatti is far from impressed with the actor who will play his character, Miles, in the Japanese version of Sideways: "They got a strange, little troll to play me."