He said: “We need to approach the game in a positive way because there’s nothing worse than playing for a draw.
“That’s when you get into difficulties. We need to take the game to Croatia and push for the win.
“The mood in the camp is really good, particularly given the way results went for us at the weekend.
“We all feel a lot more confident because there’s nothing worse than qualification being out of your own hands.
“Now the confidence is with us, we’re probably seen as favourites to get through and we’ve got to go out and get a result on the pitch.
“The match is certainly one of the biggest in my career – no question.
“When you look at what one single game means to the whole country, it’s got to be up there near the top.
“A positive result guarantees us qualification to the European Championships – something the whole country wants.”