Abdullah’s team has lodged more than 4,000 complaints over the preliminary results from September 28 presidential election.
IEC announced delayed preliminary results on Sunday, based on which incumbent president Ashraf Ghani secured 50.64 percent while Chief Executive Abdullah Abdullah earned 39.52 percent.
Abdullah rejected the results, saying his team would win the election if fraudulent votes are removed.
The three-day process of registering complaints is scheduled to end on Wednesday.
Yusuf Rashid, executive director of Free and Fair Election Forum of Afghanistan, called on the Electoral Complaints Commission to impartially and legally address complaints in order to ensure fairness.
Gulbuddin Hekmatyar, who followed Abdullah with 3.85 percent of votes, also protested the result which he described as false.
Hekmatyar said that a fresh election in certain areas and a full recount should have been held.
He warned of protests which he said could lead to collapse of the government if his demands were not met.
