Celtic came from behind to beat HJK Helsinki 2-1 at Parkhead in the first leg of the Champions League play-offs.
Gary Hooper and Charlie Mulgrew turned the game in the Hoops favour and Hooper is confident of completing the job in Helsinki.
"I thought we played well. We didn't take our chances in the first half and conceded a sloppy goal but we came back and scored two good goals. We did really well to respond.
"We had to step it up a level and we did. I thought we played really well."
Helsinki are 19 games into their domestic season but Hooper does not believe match sharpness was or will be an issue.
"We passed the ball well, the fitness levels were up there," he said.
"The sharpness is not there yet but we are getting there.
"We have got an SPL game with Aberdeen and take the sharpness out of that into Wednesday.
"We have just got to play like we did. We will not sit in and defend, we will go there and play football.
"We have enough attacking players to score goals. We are good on the counter-attack.
"I look to score in every game and if the chances come like they did in the first leg then I think we have a good chance."