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."