The 19-year-old, who proved crucial in helping Pescara gain promotion to Serie A last season, is set to move to the Ligue 1 giant for a reported
"He should sign his contract either at the start of next week or at the end of this week."
Verratti has made 74 appearances for Pescara since making his debut with the Italian outfit at the age of 16.
The Italy Under-21 player is also a reported target of Juventus and Napoli.
Verratti is under contract with Pescara until
Socceroos midfielder Carl Valeri will play Serie A football for the first time after Sassuolo claimed a maiden Serie B title with a 1-0 victory over third place Livorno.