Gibson, who came through the ranks at Manchester United and also played for Everton, was involved in a road traffic accident and later charged for being under the influence.

The Republic of Ireland international had only recently been allowed back on the road after a 20-month driving ban for hitting a cyclist while driving, also with "excess alcohol" in his system on that occasion.

Gibson, 30, has played 15 times in the Championship this season, but is unlikely to feature again soon as Sunderland has opted to suspend him and investigate.

"We expect the highest standard of behaviour from our players and should any individual fall short of those standards then robust action must be taken," Club chief executive Martin Blain said.