Malawi's opposition party has rejected a report to be released by the European Union observer mission on the country's disputed elections.

The EU delegation is expected to release its report on Wednesday.

Malawi Congress Party (MCP) deputy spokesperson Ezekiel Ching'oma has claimed the delegation "cooked up" its report.

Malawians are waiting for the constitutional court to rule on an election petition lodged by MCP and the United Transformation Movement (UTM).

The two parties want the results of the May 2019 election nullified citing electoral malpractices.

The electoral commission and another political party - the Democratic Progressive Party (DPP) - have said that the elections were free and fair.

President Peter Mutharika was declared winner with 1,940,709 votes, followed by MCP's Lazarus Chakwera with 1,781,740.

Saulos Chilima of DPP came third with 1,018, 369 votes.