Rangers look increasingly unlikely to play in the Scottish Premier League next season after opposition to its application to remain in the top flight increased to six clubs.

Aberdeen chairman Stewart Milne says Monday ''it is our intention to oppose readmission to the SPL for any Rangers newco.''

The 140-year-old Glasgow club has won a record 54 domestic league titles but has tax debts of 21 million pounds ($32.7 million) and entered bankruptcy protection in February. Failure to secure agreement with tax authorities led to Rangers chairman Charles Green purchasing the club's assets in a 5.5 million pound ($8.6 million) deal and establishing a newco.

A Rangers newco needs an 8-4 majority at a July 4 vote but Aberdeen, Inverness and St Johnstone on Monday joined Hearts, Dundee United and Hibernian in opposition.

If unsuccessful, Rangers face second-tier football or even lower.

Also Monday, prosecutors instructed Strathclyde Police to investigate any alleged criminality over Craig Whyte's takeover of Rangers in 2011. Whyte has denied any wrongdoing.