The prolific attacker has slammed the Blaugrana director for his lack of knowledge about the game and has defended the work of his charity.
A number of recent reports suggested that the prolific attacker had requested a pay increase which would make him the best paid player in La Liga again, prompting Faus to stress that Barca has no intention to hand Messi a new deal hardly a year after his previous extension.
However, Messi has insisted that he never asked for a new deal and has hit out at Faus for his lack of football knowledge.
"Faus is a person who does not know anything about football," Messi told RAC1. "He tries to run Barcelona like a business, but this is a football club. Barcelona are the best club in the world and should also have the best directors in the world.
"I have never asked for a new contract and neither has any of my representatives."
The 26-year-old also took the time to discuss recent allegations that his foundation is involved in a money laundering scandal and stressed that he has not done anything wrong.
"I haven't read anything myself, but my family has told me what's being said. I deeply regret these allegations because everything we earn with these games goes to charity."
Messi is currently recovering from a hamstring injury in Argentina.