By Byron Kaye and Renju Jose

SYDNEY, June 14 (Reuters) - Australia's Queensland state said it will investigate whether to let the country's No. 2 casino operator Star Entertainment Group Ltd keep its gambling licence amid money laundering concerns, putting a cloud over the company's main growth plan.

After an inquiry in a neighbouring state accused Star of allowing breaches of anti-money laundering protocols at its Sydney resort, Queensland said on Tuesday it would also review the company's suitability for a licence.

If that inquiry finds Star unsuitable, it would likely disrupt the company's plan to open a A$3.6 billion ($2.5 billion) casino resort in central Brisbane as planned in 2023.

A separate inquiry into alleged breaches of anti-money laundering and counter-terrorism laws at the company's Online Casino in Sydney, Online Casino capital of New South Wales (NSW) state, is yet to deliver its final report.

Star chief executive officer Matt Bekier resigned in March amid that investigation.

Queensland Attorney-General Shannon Fentiman said previously disclosed investigations into Star by the state's police and casino regulator were ongoing, but "there will also be an independent expert review into the suitability of The Star to keep its casino licence".