The Brazil international moved to Barcelona in a £48.6 million deal in June and has scored two goals in nine appearances this season.
|33/1||Neymar is 33/1 with Coral to be the top scorer in the Champions League
"I spoke with his father when we met in Miami and we closed the deal there," Rosell told Cadena SER.
"There were four parties that owned his rights as part of the agreement and we had to agree with all of those, but in the end we closed the deal for €57.5m.
"The key was that the player wanted to come to Barcelona. It was not about knowing how to negotiate; he wanted to be play next to Messi and the rest of the team.
"Everything was based on that despite him having offers from Manchester City, Chelsea, Bayern and Real Madrid.
"Neymar's a very humble, friendly guy, a great team-mate and a great player. He is not selfish on the ball, which is just what we want in a football player. Has has settled perfectly into the squad."