The Al Sadd coach, who turned down the head coaching job at Barca in January, watches his former club as a fan these days and probably with a view to taking over in future.
Asked his thoughts on the team in an interview with La Vanguardia, the former midfielder said: "A large part of the squad is extraordinary.
"Starting with the goalkeeper [Marc-Andre ter Stegen], who I think is the best in the world; Jordi Alba, for me, is the best left-back in the world; [Gerard] Pique, the best centre-back in the world; [Sergio] Busquets, the best defensive midfielder in the world; and [Leo] Messi, the best player in the world.
"And, if you add [Luis] Suarez, then [Frenkie] de Jong and Arthur, they are footballers who can triumph for 10 more years at Barca. The base is really good."
Reflecting on what he would change, he said: "I would sign wingers, like Neymar. I don't know if he would fit because of the social aspect (many fans are against his return), but in football terms, I have no doubt he would be a spectacular signing.
"Barca can play inside, but they are missing wingers like Bayern [Munich] have. They don't need too many new ones: Jadon Sancho, Serge Gnabry..."