Marquinhos bundled home the opener shortly before half-time at the Parc des Princes to cap a strong first-half performance.
Uruguay international Edinson Cavani then scored his fourth goal of the season from the penalty spot to secure the three points for Blanc's side.
"We expected to find a well-consolidated and well-organised team," he told the club's official website.
"This is what happened. As often happens when you score it unlocks the game.
"The opposing team takes more risks. It took a long time to score the second goal, but we succeeded."
"It feels good to be back on the field," he added. "It was four and a half months since I last started a game. So it was fun, especially to end with victory.
"Physically, I'm still a bit short, but you find your rhythm by playing."
