Verratti is reportedly Barca's top transfer target and the PSG midfielder is believed to be keen on a move to Camp Nou.
But PSG are reluctant to sell the Italy international after Barca president Josep Bartomeu confirmed last week that the Catalans want the 24-year-old .
Speaking at the unveiling of full-back Nelson Semedo on Friday, Fernandez provided an update on Verratti.
"He currently has a contract [with PSG], so there is little I can say," Fernandez told reporters.
"If you want to make something happen with a player who has an ongoing contract then you first need to come to an agreement with his club."
A €100 million transfer fee has been mooted for Verratti, who has won four Ligue 1, Coupe de la Ligue and Trophee des Champions titles since arriving from Pescara in 2012.