Sheikh Muhammad Yakoob is contesting from a constituency in Lahore under the banner of Milli Muslim League (MML) - a political front of the Jamat-ud-Dawah (JuD).
The seat fell vacant after the Supreme Court on July 28 disqualified Sharif in the Panama Papers case. The JuD recently launched the political party and fielded Yaqoob against Sharif's wife Kulsoom Nawaz.
Kulsoom has undergone a successful throat surgery in London and in her absence her daughter Maryam is running her election campaign.
The ECP yesterday issued a notice to Yaqoob barring him using Hafiz Saeed's picture in his election campaign.
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The ECP also restrained Yaqoob from using the MML name.
"Yaqoob is required to strictly comply with the ECP code of conduct otherwise action will be taken against him under law," it said.
The election will be held on September 17.
There were reports that Kulsoom could become the prime minister for the remaining eight months of the PML-N government if she wins the election.
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