Roy Keane has held discussions with Celtic over succeeding Neil Lennon as manager.
And Sportsmail understands the Manchester United legend is one of a list of candidates the Parkhead club have already spoken to.
Red Bull Salzburg's American coach Jesse Marsch admitted he was 'honoured' to emerge as a target before opting to stay put in Germany, while Manchester City under-23 coach Enzo Maresca and ex Sheffield United boss Chris Wilder are also interested. Scotland boss Steve Clarke has also been heavily linked with the role.
Roy Keane has held talks with Celtic over the Scottish giants' current managerial vacancy
In a statement earlier this week largest shareholder Dermot Desmond vowed to take time to appoint the right man, insisting the process of 'research, investigation, interviewing and negotiation' is underway.