The former Blaugrana boss believes two of the club's star players will be a success at Camp Nou ahead of the new season
The Brazilian secured his move to Camp Nou earlier in the summer but it is unknown which role the 21-year-old will be given alongside Messi.
However, the Bayern Munich boss believes the duo will have "no problem" playing together at his former club.
He told Lance: "Barca have always had some of the best players in the world at their disposal, and Neymar and Messi are undoubtedly two of the best at the moment.
"I know Messi very well. He is a fantastic person as well as player. I have met Neymar too and he seems like a good lad and I'm sure they will have no problem playing together."
The 42-year-old believes his Spain will go into next summer's World Cup as favourites to retain their title - despite their 3-0 defeat to Brazil in the Confederations Cup final a fortnight ago.
He added: "It seemed perfectly normal to me that Spain lost [to Brazil]. They were physically better than us.
"But I believe that Spain are still favourites going into the World Cup."
Neymar is set to make his competitive debut for Barcelona against Levante on August 18.