Gordon Strachan's side face their Portuguese opposition at Parkhead next Tuesday, realistically needing to win the match to remain in with a chance of reaching the last 16.
Kilmarnock held Celtic to a goalless draw as they unfurled their league championship flag on the opening weekend of the season.
And Celtic have now lost three of their last four games, the latest defeat seeing them dumped out of the CIS Insurance Cup by Hearts on Wednesday.
Wright said: "I think we can benefit from the fact that they might have one eye on Europe and they've also had a couple of midweek games to contend with in the last few weeks.
"Most of their players have been away on international duty as well so I hope we can take advantage of that."
Wright hopes Celtic will have little to offer in reply if Jim Jefferies' side can get in front tomorrow.
He explained: "If you get the first goal it gives you confidence and it quietens their fans down. If they get ahead then it's a real uphill struggle."
Wright was accused by Hearts' French striker Christian Nade of insulting his family during last weekend's encounter at Rugby Park.
The Jambos frontman received a straight red card for shoving over Wright, and Wright is still stunned Nade is claiming he was provoked.
Wright said: "As far as I'm concerned the Nade thing is over. He came out and said what he did and I have denied it so there's nothing more to add.
"When I was told about what he'd said I couldn't believe it. I said to my wife, 'How could I insult his family? What could I have said?'.
"It was baffling.
"(Hearts midfielder) Michael Stewart said he was close to it and he said he hadn't heard anything untoward, so for Nade to come out and say what he did on their website was strange."