Rajab was arrested earlier this month on unspecified charges in what appears an escalating crackdown by the Sunni-led government that also included a court shutting down a main opposition society and a decision to strip the spiritual leader of the island's Shia Muslim majority of his citizenship.
Jalila Sayed, Rajab's lawyer, told supporters in an e-mail that he faces a prison term for tweets he made last year accusing security forces of torturing detainees in a main prison and of killing civilians in a war led by Saudi Arabia in Yemen.
Bahrain revokes Shia cleric's citizenship over charges of ‘sectarian divisions’
"He was notified of the referring of his case regarding Jaw prison and the Yemen war to the High Criminal Court for trial" Sayed wrote. "The first hearing will be on 12 July 2016. Nabeel may face up to 13 years of imprisonment if convicted in that case," she added.
There was no immediate comment from Bahraini authorities regarding the case. Officials there deny systematic abuses of human rights and have accused the opposition of stirring sectarian hatred in the kingdom and serving the interests of their rival, Shia Iran.
Bahrain arrests 8 'terrorists' fleeing to Iran by speedboat
Rajab has repeatedly been arrested since 2011 pro-democracy protests mainly by Bahraini Shias were repressed with help by Saudi Arabia.
The kingdom hosts the US's Fifth Fleet and is considered by Sunni-ruled Gulf kingdoms as a strategic bulwark against Iranian influence in the Arab world.
The Bahraini government drew US and United Nations condemnation earlier this month when it announced the country's top Shia cleric, Ayatollah Isa Qassim, would be stripped of his citizenship and when it closed down al-Wefaq Islamic society.
It had accused both of being linked to Iran and of fomenting sectarian tensions in the island kingdom, charges they deny.
An administrative court began hearing a petition by the justice ministry to dissolve al-Wefaq but postponed the hearing until September to give the group time to respond to the charges.
On Sunday, the group's lawyer said that the court has informed him it was advancing the date for the hearing to June 28.
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