Striker Callum Osmand says Celtic Park must be "terrifying" for opponents when supporters are in full voice.

The forward's substitution against Besiktas on Thursday night helped inspire Martin O'Neill's side to a first Europa League victory of the season.

Celtic were trailing 1-0 in the second half before the introduction of Osmand and fellow striker Camilo Duran.

Osmand scored with his first touch and set up Duran for the second before the Colombian added a third after Celtic had been pegged back again.

"You feel it, the crowd erupts and they really lift you," Osmand said of the atmosphere midweek.

"It's incredible. When you've got Celtic Park like that, I feel for the opposition. They must be terrified because it lifts all of us and we're so grateful for them.

"And the support when it gets like that is unmatched. It's a great place to play and hopefully we can see more of those moments."

Celtic return to domestic action when they host Kilmarnock on Sunday and can ill-afford to slip up after last weekend's defeat to Falkirk.

"I completely understand what it means to people," the 20-year-old said.

"It's a huge club and we want to be at the top and that's what we strive to do.

"We know we need to be better at times, but I think it is just building off the good moments and learning from the bad and that's all you can ask for. As long as we're improving and getting better, that's all you can really ask for.

"It is important to make sure everyone's tight, especially when it's going bad. That's the main bit.

"Obviously, it's a lot tougher for everyone when it's not as good because the confidence, we might not be playing as forward as we should, and we all know that.

"But when the confidence comes and we're just free-flowing, then everyone feels a lot better and we just need to keep building on it."