Ibrahimovic joined United from Paris Saint-Germain ahead of the 2016-17 campaign and has lived up to the billing, scoring 26 goals in all competitions.
His contract with United is due to expire at the end of the season and even though he has an option to extend his stay in Manchester by one year, a move to Napoli could also be an option.
Ibrahimovic has long been a keen admirer of the Serie A side - with his agent Mino Raiola repeatedly claiming the striker would like to wear the Napoli jersey before hanging up his boots - and the Swede has now further fuelled speculation he could return to Italy.
"A move to Napoli? You never know," the veteran striker told Fox Sports.
"I am feeling well at United, but we will see what happens."