Their only hope of staying up is by winning at Charlton Athletic on Saturday, the final day of the season, and hoping Barnsley are beaten at Plymouth Argyle.
"My captain Gary Doherty said after the game that funny things happen in football and we have to believe that a miracle can happen," said Gunn.
"We hope Plymouth help us out by putting on a performance against Barnsley in front of their own fans and we need lady luck to smile on us.
"But we have to do our own job first and focus on that for four or five days. We have to face up to it but there is still a chance. I will lift the players and get them fresh, fit and focused for what will be a difficult day."