The forward completed a switch from Santos in a deal worth £49 million during the summer transfer window but, following his arrival in Spain, critics have questioned his ability to perform at the top level in Europe.
However, his experienced team-mate is certain the Brazil star, who Barca revealed suffers from anaemia, will be an instant success at the club.
|12/1||Neymar is 12/1 with BetVictor to be the top scorer in La Liga
"When you're the best and you get to our team, you adapt quickly. Despite coming from another league, he will contribute much.
"His signing only brings positive things to us."
Iniesta also commented on Cesc Fabregas and his standing in the team, as the midfielder looks set to stay at Camp Nou with Manchester United having seemingly given up on the Spaniard.
"For me, he [Fabregas] is undisputed in this club," he continued.
"My team-mates are always the best and the important thing is that competition makes us all better, because ultimately the team are winning the titles, not the individuals.
"He is a key player for us, he always performed at the highest level and will continue to do so."