Celtic will conclude their Champions League group stage campaign with a daunting trip to the Bernabeu to take on reigning champions Real Madrid on Wednesday.
Ange Postecoglou's side have already been eliminated from the competition and are guaranteed to finish bottom of the group after taking just two points from their opening five matches, although their performances have been, on the whole, better than their results suggest.
The Bhoys will now round off their campaign with a glamour tie away to 14-time European champions Real Madrid, who are already guaranteed their place in the knockout stages but still need a result to ensure they qualify as group winners.
That need could make Wednesday's clash even tougher for Celtic, who are to spring a surprise in Madrid, but the Bhoys can at least draw confidence from some of the previous shock results in the Champions League group stage.
|What||Real Madrid v Celtic|
|Where||Santiago Bernabeu, Madrid|
|When||17:45, Wednesday 2nd November|
|How to watch||BT Sport 4|
|Odds||Real Madrid 1/5, Draw 6/1, Celtic|
Celtic do not have to look very far for inspiration when it comes to springing a surprise in the Champions League, as the Bhoys claimed a shock 2-1 victory over Barcelona at Parkhead during the 2012/13 group stage.
On a raucous night in the east end of Glasgow, goals from Victor Wanyama and Tony Watt put Celtic two goals in front and they were able to hold on despite a certain Lionel Messi pulling one back late on for Barca.
The victory was made even more impressive as it was achieved despite Celtic having just 16.4% possession, while they were facing a Barca outfit that had been crowned champions of Europe in two of the previous four years.
Neil Lennon's side went on the qualify for the knockout stages of the Champions League that year - the last time a Scottish team has achieved that feat - and the current Celtic team are to replicate that 2-1 victory at the Bernabeu this midweek.
While it could be argued Celtic's victory over Barcelona is little more than a fading memory, the Bhoys will be able to take plenty of hope from Real Madrid's shock home defeat to Sheriff Tiraspol during last season's group stage.
The Moldovan outfit were embarking on their first campaign in the group stage, and after beating Shakhtar Donetsk on Matchday One, they would have gone into their trip to the Bernabeu with renewed hope if not confidence.
Jasurbek Yakhshiboev gave Sheriff a shock lead in the Spanish capital, but many would have expected Real to go on and win the match when Karim Benzema levelled from the penalty spot during the second half.
However, it was Sheriff that had the last laugh on the night, with Sebastien Thill striking an 89th-minute winner to send the pocket of travelling supporters into jubilation.
Unfortunately for Sheriff, they did not win another match and exited the competition, while Real would go on to not only top the group, but win the competition for a record-extending 14th time. Carlo Ancelotti's side are to defend their title this term.
It is not just Spanish teams that have been on the receiving end of shock defeats in the Champions League group stage, with English clubs having also had their fair share of surprise setbacks.
Manchester United suffered a shock 1-0 defeat at Lille during what was a disastrous 2005/06 group stage campaign. Milenko Acimovic scored the only goal of the game for the French team in that fixture.
Remarkably that was Lille's only goal in that's season competition, but they still finished above United, who propped up the standings and suffered an early European exit.
Arsenal have also been on the receiving end of a shock Champions League defeat. The Gunners went down 1-0 at Real Mallorca in their opening match of the 2001/02 campaign - the Spanish side were making their debut in the competition.
Arsene Wenger's side were up against it when they had Ashley Cole sent off early in the first half, with the England star receiving his marching orders for conceding a penalty that was converted by Vicente Engonga.
Things got worse for Arsenal, as they also lost their second match in that season's competition to Panathinaikos, although the Gunners did ultimately qualify for the round of 16, ironically edging out Mallorca.
All these results should give Celtic some hope of springing a surprise in Madrid during the week, although Real remain the overwhelming favourites to win what will be the first meeting between the two sides at the Bernabeu since 1980.