The Frenchman was happy to see his side defeat Reims as they prepare to get into the right "mindset" ahead of the second-leg at Stamford Bridge
The French champions recorded an easy 3-0 win over Reims at the Parc des Princes thanks to a strike from Edinson Cavani and two Aissa Mandi own-goals.
They also hold a 3-1 advantage over Jose Mourinho's men in the Champions League quarter-finals and Blanc is looking forward to the return leg.
"Every game has its worth, but it was placed before a Champions League match which everyone is thinking about," he told reporters.
"It is never easy to approach these games with the right mindset. It's a very good thing to have won this match. It's worth three points and, in our position, we cannot lose points at home."
PSG's clash with Chelsea at Stamford Bridge kicks off at 20:45CET on Tuesday.