The Belgian has scored 16 goals in all competitions for Jose Mourinho's Premier League title-chasers and Blanc, whose charges sit top of Ligue 1 ahead of this week's UEFA Champions League quarter-final first-leg showdown, is wary of the danger that he will pose.
"Eden Hazard is a player that always impresses me, he has progressed a lot since arriving at Chelsea," he said of the player who made a big impact in France with Lille.
"Chelsea are a team who are very strong defensively and efficient in attack.
"They are a side which seldom concedes, while we score a lot - it will be an interesting match tomorrow."
Blanc called for patience as the club seek to join Europe's recognised heavyweights, starting with the challenge of bettering last year's quarter-final marker.
"It is very exciting for a coach to be part of a project like that of Paris Saint-Germain," he said.
"It will take a little time to become a great European club, we're getting there one step at a time."
