"It didn't look good for us at half-time but we kept at it and got a fantastic win. So we're in a position where we have everything to play for and if we try as hard as we did at City, I think we have a chance.
"We knew that if we lost that game we would be out of it, so the win was a great achievement and it gave us confidence and we still have a chance to get out of trouble."
Birmingham will be certain to come to the Cottage in no mood to surrender the points and Hangeland is expecting an uncompromising afternoon.
"I think we can expect a tight and really tough game," he said. "It will be a physical game and we have to be prepared for that. Considering our position in the league, our fans have been fantastic and they will play a major part again this weekend."