The Council of Europe says Georgia has made some progress in overhauling its justice system, but expressed concerns that the authorities may be abusing the law to target the opposition.
In a report, Nils Muiznieks, human rights commissioner for the Council of Europe, said long-standing structural problems needed serious attention, in particular the independence of the judiciary.
"The commissioner is concerned about allegations of politically motivated measures targeting members of the opposition, especially with regard to the use of pretrial-detention measures against them," he said.
Dozens of former officials who served ex-President Mikheil Saakashvili, including a former prime minister, have been arrested on charges such as abuse of power and corruption since Saakashvili's government lost power in 2012.
Wanted in Georgia on charges he abused his authority, Saakashvili currently lives in Ukraine, where he is the governor of the Odesa region.