Sheikh Ibrahim Zakzaky was arrested after deadly clashes killed almost 350 of his followers.
Kaduna's state government declared the Islamic Movement in Nigeria to be unlawful on Friday.
More than 300 people were reportedly killed in December's clashes between Shiites and the army.
A government official admitted that 347 Shiites were buried in a mass grave after Nigerian army clashes.
Sheikh Zakzaky's lawyer is demanding his client's unconditional release after four months in detention.
The Islamic Movement in Nigeria say they have no ties to the Sunni militant group.
At least 300 people died in clashes between the Nigerian Army and the country's main Shiite movement.
The Nigerian Shiite leader was arrested in December 2015 and is being held without charge.
Nigerian Shiites clashed with the army in December, with 300 sect members reportedly killed.
The Shiite leader has been detained since December, when soldiers clashed with Shiite sect members.
Femi Fani-Kayode said "all hell will break loose" if the high-profile prisoners are harmed.
At least 300 Shiites were killed in clashes with the army in Zaria, northern Nigeria.
At least 60 people died in clashes between Shiite Muslims and Nigerian soldiers on Saturday.
The Shiite movement claims dozens of its members were killed by soldiers on Saturday.