The 18-year-old cannot believe that he is currently getting to share a dressing room with the four-time Ballon d'Or winner, admitting that he is trying to learn as much as he can
The 19-year-old attacker joined the Catalan club from Atletico Madrid in 2011 but only broke into the Blaugrana B team earlier this year.
However, new Barca boss Luis Enrique brought Munir into the senior squad this summer and, after impressing in pre-season, the youngster marked his Liga debut, against Elche, with a goal.
He has since been called into the Spain Under-21 squad and now admits that he is struggling to get his head around his meteoric rise.
"I didn't expect all of this to happen," told reporters on Tuesday. "It has come through working hard every day and at the end it's the reward you receive.
"It's a dream come true to train with my Barcelona team-mates. I have always said Messi is my idol and he still is.
"I learn every day from them; how could I not? I watch everything they do.
"I try to be the same person I always have been and I'll try to keep doing that. My aim is to do my best every day and I'm relaxed. It's a prize; it's like I won the lottery!"
Munir is eligible to play for Morocco but he says that he does not want to get drawn into a debate over who he should represent at international level at this point in his career.
"Right now I'm with the [Spain] under-21s and very happy," he stated. "Everything else, we'll see.
"It's not something I think about. I have to stay calm and concentrate just on playing."