The Swede, 35, joined Jose Mourinho's side last summer on a one-year deal and has scored 20 goals this season.
Mourinho said on Friday he believed the club's top scorer would still be at Old Trafford in 2017-18.
When asked about his future, Ibrahimovic said: "We'll wait and see."
Ibrahimovic's goals have helped Manchester United into the EFL Cup final - where they will face Southampton - as well as the fifth round of the FA Cup. The Red Devils are also in the Europa League knockout stage.
Manchester United won the Community Shield in August and Ibrahimovic is confident of adding at least one more trophy to the collection.
"We have one and we can get our second one," he added.
"We are still in the Europa League and FA Cup, so if we don't become champions in the Premier League at least we can try and win two or three trophies."
Manchester United striker Zlatan Ibrahimovic says "nothing is done" with regards to his future but insists he has fulfilled requirements needed to extend his contract.