The veteran midfielder has praised the Brazilian for adapting quickly to life at Barcelona, while revealing he has turned down the chance to leave the club on several occasions.
The 57 million euro summer signing has been a huge hit at Camp Nou this season and a regular feature in Gerardo Martino's first-team plans, and the club's vice captain says he is not surprised that the 21-year-old has impressed.
"It's no wonder Neymar [has impressed]," he told beIN Sport. "We have already seen he is a spectacular player who is able to make a difference. He's been decisive on many occasions thanks to his goals, his passing, his dribbling and the high level he has demonstrated. We had already we had seen how good he is in the Confederations Cup, but we've seen him go up a notch."
Xavi claims he has had many opportunities to leave the Catalans during his career but insisted he never had his heart set on leaving Barca.
"I had the chance, several times, to leave the club for different reasons," the Spain international, 33, added. "But I always decided to stay for personal reasons. I'm Barca through-and-through and the final decision was always based on the most passionate and sentimental feelings."
Xavi featured in the Liga leaders' 4-1 win over Betis on Sunday, as goals from Pedro and Neymar and a brace from Cesc Fabregas secured the points against the bottom-of-the-table side.