Celtic host Inverness Caledonian Thistle on Saturday hoping to take one step closer to the hallowed treble. That's the script in Bhoys circles and within the Hoops' support, but as we've seen in the past, anything can happen in the Scottish Cup.

Richie Foran's Caley Thistle won't have read that script and will arrive with their own aims. They're looking for a cup run to distract themselves from a dismal Scottish Premiership campaign that sees them rooted to the bottom of the table behind Hamilton.

Form doesn't matter in the cup, though, and they'll fancy their chances of turning over the Bhoys on their own patch in front of their own fans. It would be a remarkable upset given Rodgers' side have gone the entire domestic campaign so far unbeaten.

It certainly won't be easy. But can they do it?

Here are THREE reasons why the Caley Jags could cause an upset this weekend...

They've done it before

Everyone knows about the famous match that inspired the 'Super Caley Go Ballistic Celtic Are Atrocious' headline in 2000. In truth, that match is enough give Inverness reason to believe anything is possible on Saturday.

However, it's not the only time Inverness have shocked Celtic in the Scottish Cup. In 2003 they did it again, albeit at home, winning 1-0 to dump Martin O'Neill's side out of the competition.

Then, in 2015, they won a dramatic, exciting and controversial match at Hampden to defeat Celtic at the semi-final stage. That was the year they would go on to win the competition for the very first time.

Three occasions that should fill the Highlanders with belief heading into Saturday's game, despite poor league form.

They're the only team to dent Celtic this season

Celtic have won every match this season, apart from one. Where all others have failed, Inverness succeeded. They may not have won but a 2-2 draw at home to the Hoops showed a rare chink in the armour of Rodgers' men, and must give them some confidence heading into a one-off tie against the Scottish champions.

They harried and hassled Celtic that day, not giving them an inch and matching their high tempo play across the 90 minutes.

It'll be a different, likely more focused, Hoops side they face on Saturday but if they can produce another performance to match that one and ride their luck a little, then forcing a replay is a real possibility.

Low energy, high stakes

Celtic Park is a fortress, and can be a cauldron of noise, but when it doesn't quite attract the crowds it is famous for then it can be a place that lacks atmosphere. We've seen in recent months that when the crowd size is lower, Celtic play with less energy themselves and that could be a factor on Saturday.

Lunchtime kick-offs are not the most conducive to atmosphere anyway, and the smaller crowd and with a motivated Inverness visiting, it has the makings of a banana skin for Celtic.

There's no doubting Celtic are heavy favourites and it's worth noting that even when playing with less flair at home they've still managed to grind out wins over Hamilton, St. Johnstone, Partick Thistle and Aberdeen by a single goal margin over the last couple of months.

Still, it's in a match like this that the Hoops are most likely to have a team get at them, rather than a game with a big match feel to it, which would only bring out the best in Rodgers' side.