The United Arab Emirates prime minister said on Monday Egypt's army chief should not run as a military man for president, but if he stood as a civilian that would be a personal matter, the Gulf state's official news agency reported.
A story outlining the views of premier Sheik Mohammed bin Rashid Al Maktoum appeared on the WAM agency several hours after he gave an interview to the BBC, in which he was quoted as saying Sisi was better off staying in the military than running for president.
The UAE, along with the Gulf's dominant Sunni Muslim state Saudi Arabia, championed army chief General Abdel Fattah el-Sissi after he deposed Islamist President Mohamed Morsi last year.
They have since given Egypt billions of dollars in economic aid.
Sisi, who removed Morsi in July after mass protests, gave his clearest indication yet on Saturday that he will run for the presidency.
The WAM story quoted an official source in Sheik Mohammed's office as saying:
“His Royal Highness's brotherly advice is that General al-Sisi should not run as a military man for the post of the presidency. However his nomination as a civilian, in response to the demands of the people, that is a personal affair that only concerns General Sisi.
“The source ... affirmed that the UAE respected the will of the Egyptian people and supports their political choices.”
In his earlier comments reported by the BBC, Sheik Mohammed, who is also the ruler of Dubai, also said Egypt was better off without Morsi.
In Cairo, the Egyptian Foreign Ministry declined to comment.