Poland top the group after beating the world champions 2-0 earlier this evening, and Keane - who hit a hat-trick in tonight's rout at the Aviva Stadium - says that his teammates can achieve the same feat.
"We are certainly going to go there and give it a right go, no doubt about that," he told RTE Sport. "They might be world champions but we believe we can go there and get something."
Keane struck a 12-minute treble as the Boys in Green boasted a three-goal half-time lead, before James McLean added a fourth in a devastasting 10-minute spell after the break.
Goalkeeper Jordan Perez then scored an own goal to make it five on 52 minutes, before McLean and Wes Hoolahan added gloss to the result shortly after.
Kickoff in Gelsenkirchen is scheduled for 7.45pm and the game will be covered live by Sports Mole.