The two teams clash at the Parc des Princes on Sunday with PSG, second on 32 points, three behind their visitors but able to reclaim top spot on goal difference if they win.
"The game is important but it is not crucial. We won't have to draw any conclusions after the match," Garde told a news conference.
"There is a good chance we already know who the champions will be though we are among those who want to bother them as long as we can.
"Yes, we will try. We are just here for that - trying to annoy them."
"We do not even think about fighting with PSG for the title. Paris scare us," Lyon president Jean-Michel Aulas told French daily newspaper Le Parisien.
"It would be an offence to [coach] Carlo Ancelotti and [sports director] Leonardo not to be scared by a team who win their games away 4-0."
Seven-times French champions Lyon will be without injured midfielders Clement Grenier and Yoann Gourcuff for Sunday's game.
