The UN envoy for the Middle East peace process said Wednesday that Jerusalem's future status must be negotiated between Israelis and Palestinians and warned of the repercussions of any action over the disputed city.

"The (UN) secretary general has spoken many times on this issue... and he has said that we all have to be very careful with the actions we take because of the repercussions of these actions," Nickolay Mladenov told a conference ahead of US President Donald Trump's plan to recognise Jerusalem as Israel's capital.

"The future of Jerusalem is something that needs to be negotiated with Israel, with the Palestinians, sitting side by side directly in negotiations