"If there was no play-offs and the top three went up then we wouldn't have a chance so we now have a second opportunity which we must take," said Coppell.
"Play-offs are totally different and it's now a cup run.
"We've got to try and do a job up there and do better than we did in the league when we lost 1-0.
"Then it'll all come down to the home game."
Owen Coyle's Clarets enjoyed lengthy runs in both the FA Cup and Carling Cup this season and Coppell knows his side are in for a tough test.
He said: "I've got great respect for Burnley.
"They have played so many games that at various stages of the season everyone thought they had blown themselves out but they are still there and it will be a tough test.
"We have home advantage in the second leg but the way our home form has been I'd rather have both legs away.
"We have come through 46 games which seems like a lifetime so I've thanked the players. We find ourselves having to go in to extra time and I'm not sure they are grateful for that but I am at the minute."