Former Celtic midfielder Thomas Gravesen has warned Copenhagen about the Hoops.
The Danish retiree believes Parkhead will be an “inferno” when they arrive in Glasgow for the second leg.
Gravesen believes the capital side must take something from that game to stand a chance of qualifying.
Tommy Gravesen on Celtic and Copenhagen
The Danish enforcer has plenty of European experience to pass on to his fellow countrymen.
He has played for the likes of Hamburg, Everton, Real Madrid and Celtic during his star studded career.
If Gravesen tells a team to be wary of another, then there’s a good chance he will be right in that.
The 43-year-old spoke to Copenhagen’s official YouTube channel about the threat they face at Parkhead.
He said: “Copenhagen have to be ready from the start, it’s a hugely important battle and it starts right here in the Parken.
“You can’t give anything away here but at the same time you have to be positive and try to dominate to see if you can get a result to bring to Celtic Park.
“When you get to Celtic Park, Celtic know how to use it and how much pressure to put on.
“If the fans feel only one goal is needed the sound level rises and you have to be ready to experience an inferno.”
Gravesen didn’t play for Copenhagen during his career but did score three times there for the national team.
Hoops gaffer and former teammate Neil Lennon would love his side to match that tomorrow night.
Fortunately, with the Celts seeded, they can turn any performance round at Parkhead in the second leg.
But, with the Hoops on top form right now, Lennon will know his side can have the tie done and dusted tomorrow.