Reformist hopeful Mehdi Karroubi says if the elections go to a run-off between the incumbent president and Mir-Hossein Moussavi he would endorse the latter, Press TV reported.
"If [President Mahmoud] Ahmadinejad and Moussavi reach the second round I would definitely support Moussavi, and as far as I know my friends would do the same," the Reformist contender said during a Monday press conference.
"But, if I reach the second round, it would be up to them to decide whether to support me or not," he added, referring to Moussavi's campaign.
A few months ago, as the race for Iran's tenth presidential election started to heat up, there was talk of Karroubi withdrawing in favor of Moussavi, as did the Reformist camp's leading figure, former president Mohammad Khatami.
Karroubi, however, withstood the pressure, insisting that he would stay in the race to the very end. The former parliament speaker promised not to disappoint his supporters by dropping out.
In more recent comments, Karroubi said that at this stage, running with a single candidate would not be in favor of the Reformist camp.
"Running with a single Reformist candidate would... lead to our defeat, as Ahmadinejad would gain 50 percent of the vote and win the elections in the very first round," Karroubi said last week on Thursday.
On Sunday, he once again rejected rumors of his withdrawal, calling them "lies" and "psychological warfare."
The former Majlis speaker argued that by pulling out of the competition, he would only prompt some of his supporters to abstain from voting, and therefore, reduce the total percentage of ballots cast in favor of the Reformist camp.
According to Iran's electoral laws, a candidate must obtain at least 50 percent of the votes cast for an outright win. Should he fail to reach the 50% threshold, he must face the runner-up in a second and final round.