Belgium said on Saturday that it had agreed in principle to host Gbagbo pending a possible prosecution appeal, after he was cleared of crimes against humanity on January 15.
The conditions include that Gbagbo, 73, will return to court if required for a possible prosecution appeal against his acquittal, and that he surrender his passport to Belgian authorities.
“Mr Gbagbo is now released under conditions in Belgium,” an ICC spokeswoman said, without giving further details.
Gbagbo was the first former head of state to stand trial at the ICC and had been held in the Netherlands since 2011.
ICC judges acquitted Gbagbo and Ble Goude on charges stemming from a wave of violence after disputed elections in the west African nation in 2010.
More than 3,000 people died on both sides of the Ivory Coast conflict after Gbagbo refused to concede defeat to his internationally backed-rival — and now-president — Alassane Ouattara.
The former strongman and his aide Charles Ble Goude have been staying in an undisclosed location since their release from an official ICC detention centre late Friday.
Belgian immigration office spokeswoman Dominique Ernould confirmed that Gbagbo had been granted a visa.
“We have given instructions to grant him a visa… which allows him to stay for 90 days,” she told AFP.
The visa would allow him to register as a resident in Belgium. Such visas are only renewed in exceptional circumstances, Belgian sources said.
Belgian Foreign Minister Didier Reynders said on Saturday that there had been “a request from the court to host Mr Gbagbo simply because he has family in Belgium: his second wife, a child in Brussels”.
“We have concluded that it is alright for him to stay in Belgium while on conditional release,” he said, adding: “There will be surveillance.”
Appeals judges rejected the prosecution argument on Friday after Belgium said it was ready to host him.
The release conditions include that Belgium will guarantee that Gbagbo would go back to the ICC if required.
He must also surrender his travel documents, report to authorities weekly, avoid contacting witnesses in Ivory Coast, and refrain from making public statements about the case, court documents said on Friday.
The ICC’s unwillingness to let Gbagbo return to Ivory Coast could be linked to that country’s refusal to surrender Gbagbo’s first wife, Simone, despite an outstanding ICC warrant for her arrest for her role in the violence.
She was convicted and jailed by the courts there in 2015, but Ouattara granted her an amnesty last year, to allow her release after seven years in detention.
Gbagbo’s release comes at a particularly tense time in Ivory Coast.
With presidential elections due in 2020, Ouattara has not said whether he will seek a second term, and the coalition he formed with Henri Konan Bedie, his former ally against Gbagbo, has collapsed.