Having battered the Belgians 5-0 a fortnight ago, the Ligue 1 champions could only manage a 1-1 draw on home turf in Group C of the Champions League, and will now have to wait until their next match to seal their place in the knockout stages.
"I think we fell to a spirited team after the first leg," Matuidi told the press. "They found success tonight. We didn't do well.
"There was no relapse. It was a game where we didn't feel good. We would have liked to go through, but I hope we can do it in the next game."
PSG need just a point from their next game at home to Olympiacos to advance.