NATO Secretary General Anders Fogh Rasmussen has expressed concern over the arrests of opponents of Georgia's new government, following elections last month.

He urged authorities to ensure there was no political meddling in their trials.

A Georgian court decided on Friday to keep a former minister in custody but bailed two army commanders charged with abuse of power. The case has raised concern the new government, led by billionaire Bidzina Ivanishvili, is waging a political vendetta.

"I'm extremely concerned about the development we have seen since (the elections), not least related to recent arrests of political opponents in Georgia," Mr Rasmussen said at a meeting of NATO parliamentary assembly in Prague.

"It's for the legal system, the judicial system in Georgia to sort out these cases. But of course it's important that such trials are not undermined by political interference," he said.

"And we will of course follow that development very, very closely," he added.

Mr Ivanishvili has vowed to take action against former officials suspected of wrongdoing after his coalition ousted president Mikheil Saakashvili's party in an 1 October parliamentary poll.