A first-half Christian Grindheim goal earned Norwegian side Haugesund their win at Solitude in Belfast. "We had them on the back foot for long spells in the second half and could easily have come away with a draw," said Cliftonville's manager McLaughlin after the home leg.
"If we show the same commitment and effort we have every chance," he added.
Grindheim's 42nd minute goal was all that separated the two sides after a closely contested first leg in which Joe Gormley, Levi Ives and Rory Donnelly all had chances to score for the Reds.
Haugesund's Torbjorn Kallevag will miss today's match after receiving a straight red card for a high challenge on Conor McDermott late in the game.
Austrian club Sturm Graz will face the winners in the second qualifying round.