Greenwood, who has one cap with England, has pulled back from committing to Jamaica this week.
His international future remains wide open, though Tuchel says the former Manchester United forward isn't in his current plans.
"I have not spoken to him until now. I have not spoken to him or his camp," said Tuchel on Friday.
"My understanding was that he tries to play for Jamaica so we didn't give it another thought. He was not in the mix at the moment and he is not in our thoughts for our team."
Meanwhile, Jamaica coach Steve McClaren said: "He is taking his time over that, so it's a little bit disappointing. We probably have to be more patient.
"But we will keep the contact, we will keep pursuing him because I know from my conversations with Mason and his family that he loves Jamaica, respects Jamaica.
"He wants to concentrate on club football and not commit to an international team at the present moment. We have to respect that, however much we've worked hard to get him here for these camps. So, who knows in the future."