Zlatan Ibrahimović's last Ajax goal was 12 years ago
Ibrahimovic penned a one-year deal at Old Trafford this summer after seeing his Paris Saint-Germain contract expire.
The 34-year-old, who has an option to extend his deal for a further 12 months, has already scored five goals in five games for United.
He wanted to end his career at Napoli
Zlatan Ibrahimovic
But Raiola says the deal may never have come off if Napoli could have afforded the star's reported £260,000-a-week wages.
“At Ciro Ferrara’s farewell match, Ibrahimovic told me he wanted to end his career at Napoli,” Raiola told Italian station Radio Crc.
“I won’t tell you if (Napoli) president Aurelio De Laurentiis approached in the summer because I do not like to talk about the past.
GETTY
Zlatan Ibrahimovic joined Man Utd for free this summer
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"What I can say is that none of the Italian clubs could afford Zlatan. He definitely has a Neapolitan mentality though."
Ibrahimovic is in United's squad to face Feyenoord in their Europa League opener tonight but is tipped to start on the bench, with Marcus Rashford expected to lead the line.