Blanc left his job as coach of Bordeaux to take over from Raymond Domenech following a shambolic World Cup campaign.
France finished bottom of Group A as Nicolas Anelka was sent home following a bust-up with Domenech and the players went on strike and refused to train in protest at Anelka's treatment.
But Marseille coach Deschamps believes Blanc is exactly the right man to rebuild the national side and restore pride and belief in Les Bleus.
"I am convinced that Laurent Blanc has the human and professional qualities to do a good job," said Deschamps.
"The situation is dire. It is a construction site. Laurent Blanc is not David Copperfield.
"He will have the advantage with his name, to command the respect and credibility.
"He is the man for the job. But he cannot do it alone.
"(Playing for France means) being given the duties and obligations - both on and off the field.
"This is not a sacrifice. To be there, to hear the Marseillaise... I considered myself a privileged person.
"I was fortunate to have a president [at Marseille], Bernard Tapie, who explained early on that there was what happened on the pitch, but then it was also necessary to look beyond. That's what I try to convey to my players.
"But, today, there are more who hear rather than listen."