Speaking to the press after meeting Spanish Foreign Minister Miguel Angel Moratinos, Grabar-Kitarovic said Moto's sojourn in Croatia were being investigated by the police.
Moratinos said that Croatian authorities had absolutely nothing to do with the issue and that they had informed the Spanish authorities as soon as they found out that Moto was in Croatia.
The Spanish minister said a memo was being drawn up about Moto's movements in Croatia and thanked Croatia for helping with the case.
Croatian Interior Ministry spokesman Zlatko Mehun confirmed in April that Moto had stayed in the country the month before.
Moto returned to Spain in late April, over a week after his wife had reported him missing, to dispel fears that he had been murdered. He said on that occasion that he had left his Spanish home for Croatia and that he had nearly been killed on a boat off the Croatian coast. On his return to Madrid he accused Equatorial Guinea and Spain of conspiracy to have him killed. Both countries dismissed the accusations.
Moto is charged with involvement in an attempted coup in Equatorial Guinea last year. He lives in Madrid, where in 2003 he formed a government in exile.
He claimed he became a target because Spain wanted good relations with its former colony because of oil.
Moto said he had gone to Croatia to raise money for his political activity. He said that in Croatia he had been taken to a yacht by people who wanted to kill him but eventually changed their minds because he is a Catholic. Later he asked that Spain be investigated, although he said he had no proof of its involvement in a conspiracy to have him killed.