Raisi made the remarks in a meeting with Faeq Zaidan, the visiting head of the Supreme Judicial Council in Iraq, held in Tehran on Tuesday.
The Iranian president warned against wastage of time in ongoing efforts to consign the perpetrators of the atrocity to justice, Press TV reported.
"Pursuance of the case until the achievement of result will show that Iran and Iraq stop at nothing in their bid to enable administration of justice" towards those behind the assassinations, he added.
Raisi, however, said Iraq's resolve to address the Americans' "appalling" foul play and its efforts to bring those who had ordered, advised, and committed the atrocity to justice was clear to the Islamic Republic.
General Soleimani, commander of the Quds Force of Iran’s Islamic Revolution Guards Corps (IRGC), Abu Mahdi al-Muhandis, the second-in-command of Iraq’s Popular Mobilization Units (PMU), and their companions were assassinated in a US drone strike authorized by former US President Donald Trump near Baghdad International Airport on January 3, 2020.
For his part, the Iraqi official said the endeavor towards trial of those, who had partaken in the "terrorist crime," was one of the most important examples of Tehran and Baghdad's judicial cooperation.