Jan Vennegoor of Hesselink is convinced Celtic fans will roar their team on to victory over AC Milan on Tuesday evening.
Celtic entertain the Italians in their Champions League Group H tie knowing anything less than three points will end their interest in this year's competition.
Milan beat the Scottish champions 2-0 in the league opener at the San Siro in September but former Hoops striker Vennegoor believes Neil Lennon's side will turn the tables with the home crowd's backing.
Victory for Celtic, and a Barcelona win over Ajax in Amsterdam, will put qualification for the last 16 back into their own hands ahead of a final-day showdown against Barca at the Nou Camp on December 11.
Milan, who have won just three of their last 17 away games in the Champions League, have gone five matches at home without a victory and several hundred of their fans blockaded the players at the San Siro on Saturday following their 1-1 draw with Genoa.
That result was in stark contrast to Celtic who, thanks to two late goals from Derk Boerrigter and Kris Comons, beat Aberdeen 3-1 at home to remain unbeaten in the league since the start of the season.
"Celtic got a boost with the late win against Aberdeen and that's good for their confidence," said the Dutchman, who scored 34 goals in 78 games for the club between 2006-2009.
"But Milan are struggling a bit in the league and had to calm down the supporters at the weekend. There is a little bit of crisis and when you have a crisis, there are things in the paper and it's not good for confidence.
"I saw some footage of it and it was quite intimidating. It's not good when you have to defend yourself against the supporters for not playing at your very best.
"Fans can lift a team. It sparks something within a player. When I played, it made you run a mile harder. It's not like you don't work hard in a normal league game but it's just that extra step.
"The crowd here is always behind you, the whole game. I never had a big game when the supporters were not on their feet pushing you on, even when you were behind.
"It gives you something special to go 90 minutes and beyond and I think Celtic really have a chance to win the game."