Pulis' side need one point from their remaining two games.
The first of those is a home clash with Kiev on December 1, and the Stoke boss added: "Kiev at the Britannia now is a cup final.
"If we win the game, we'll win the group, and if we don't get beaten, we'll go through, it's as simple as that.
"It's a massive game for us and I'm sure it'll be a great night because they are a good side. I think it's the toughest group so, if we do it, it's a big achievement, but we still have to do it."