The Brazil starlet, who completed a £48 million move to Camp Nou earlier this summer, was awarded the Confederations Cup Golden Ball as the tournament's best player after helping his side retain the trophy on home soil after a 3-0 win over Spain in the final.
|7/2||Barcelona are 7/2 with bet365 to win the Premier League
"As some say, we were lucky to sign Neymar before the Confederations Cup," the 49-year-old told Sport.es. "Let's just say lucky, yes.
"All good people understand these situations. And these [Messi and Neymar] are two good people."
Rosell also took the opportunity to comment on Bojan Krkic, who on Saturday completed a one-year loan move to Ajax, revealing his hope that the striker will still become an important player for Barcelona in the future.
"Besides being a very dear person, is a very good player who needs minutes to play and prove he's a scorer," Rosell added.
"Choosing Ajax is perfect for him to keep growing and someday return to Barca - that would be our dream."