He said this in an interview with Belgian TV channel VRT, Censor.NET reports referring to 5 Channel.
Poroshenko also called to stop helping Russia in undermining the situation in the country.
"I do not rule out that some of the ministers in our government will be changed. This is a normal democratic practice. But I am against early parliamentary elections and changes within the coalition. We have to unite the nation and not allow Russia or irresponsible politicians in the country to destabilize the situation," the president said.