The Qatari insists that he is "not interested" in recruiting the Argentine forward, who has won the FIFA Ballon d'Or for the past four years in a row.
"I haven't spoken to Messi because I'm not interested," he told AS. "You would have to ask the Barca president [if he is available], not me.
"I won't pay what they say he's worth. I'm a realist and that amount is unrealistic. I'm not thinking about the possibility at all."
Messi has been at Barcelona his entire career.