The Parc des Princes side were hit with a fine of €60million earlier this month after breaching Uefa's Financial Fair Play rules and PSG have agreed to significantly limit their spending for the next two campaigns.
However, Blanc is still confident the capital club will be able to improve their squad and has praised the individual qualities of Hazard as he draws up a list of summer targets.
"Hazard is the kind of player who can be decisive," Blanc told Le Parisien.
"You can talk about all kinds of things; tactics, strength of the team, individual class, but a player who is capable of beating three or four players is something else. You never know what to expect from him.
"Unfortunately for us, next year we'll be watched by Uefa. We will not be able to do what we want, but I think we will be able to improve the team anyway. We'll be working within UEFA's new constraints and want between two and four recruits.
"We already have a very good team in my opinion, so it does not take a lot of players. I think we'll get to do what we want to improve the team."
Blanc also confirmed that winger Jeremy Menez will leave the club and also hinted that defender Alex - whose contract expires at the end of next month - may depart as well.
"Menez will leave," Blanc added.
"With Alex the matter is more complex, but we think he may leave. Perhaps there will be movement with players under contract. We will try to anticipate their intentions."