Celtic striker Scott McDonald's controversial challenge on Dundee United defender Lee Wilkie has been referred to the Scottish Football Association's review panel.

Referee Stuart Dougal did not get a proper view of the original incident during Celtic's 2-1 victory last night so he has handed the incident on to the panel.

McDonald is the second Celtic player to be referred this week after Glenn Loovens' challenge on Rangers midfielder Maurice Edu sparked another probe.

An SFA spokesman said: "The same review panel will consider both incidents and we hope to get it convened by the end of this week."

Both players will be free to play in Celtic's Clydesdale Bank Premier League run-in as the review panel refer the matter to the SFA's disciplinary committee, which will next meet following the end of the season, if they decide either player has a case to answer.

McDonald's studs caught Wilkie on the shin after he raised his foot while stretching to make a sliding challenge.

The incident sparked a major row between Dougal and United boss Craig Levein, who criticised the referee's response after being urged to allow treatment to the defender.

Levein may yet find himself in trouble over his comments if the SFA's general purposes committee decide to take the matter further.