RANGERS have said they will "co-operate fully" with investigations following the "disgraceful scenes" at their Premiership final game against Motherwell on Sunday.

Rangers say that defender Bilel Mohsni's behaviour was "completely unacceptable" and had his contract with the club not now expired, the club would have started disciplinary proceedings.

The comments came after Rangers substitute Moshni kicked and punched Motherwell's Lee Erwin after being pushed by the striker.

Officials have said the club will "also assist with any investigation into the behaviour of Motherwell supporters", a reference to an incident where defender Lee McCulloch was struck by a supporter's flag. Video footage of the incident, which happened just before half-time, was shared thousands of times on social media.

Rangers added: "We would like to thank the Rangers fans who were excellent in showing admirable restraint despite severe provocation."

Players and officials from both teams tried to break up the trouble with further scuffles breaking out.

Motherwell fans also ran onto the pitch to celebrate in front of the Rangers support before being cleared by stewards and police.

The brawl on the final whistle resulted in red cards for Mohsni and home duo Erwin and Fraser Kerr.

Motherwell won the match 3-0 and the two-leg tie 6-1 on aggregate to maintain their place in the Scottish Premiership and confine Rangers to a second season in the Championship.

Police Scotland has said it would be launching a "full review" in light of the ugly scenes.