Presidential candidate Hamdeen Sabbahi said Sunday that he would not serve as vice president to an Islamist or a member of the former regime because it would be against his political perspective and his view of what Egypt needed.
An Islamist president would not be good for Egypt or the revolution, he added.
Sabbahi said his discussions with other revolutionary candidates would conclude within several days and they would create a team to back one of them in the presidential race.
He made the comments while on the campaign trail in Kom Hamada in Beheira governorate.
Sabbahi is a veteran Nasserist opposition figure and former member of the People's Assembly. He is also an outspoken critic of the United States and Israel.
He officially announced his presidential bid in March 2011, opting to run on an independent ticket and not through the Karama Party, which he founded.
He did not run in the parliamentary elections later that year, in order to focus on the presidential contest.
Presidential elections will take place on 23 and 24 May, and the president will be named on 21 June after a run-off voting round on 16 and 17 June.