Martin O'Neill revealed his shock at getting the call to return to Celtic.
The legendary manager was announced as the club's new interim boss on Monday night following Brendan Rodgers' resignation.
O'Neill will be supported by his former midfielder Shaun Maloney at Celtic Park.
Rodgers stepped down after Celtic dropped eight points adrift in the title race following a defeat to leaders Hearts on Sunday.
The club contacted O'Neill to take over on an interim basis on Monday afternoon, he has revealed.
Speaking to talkSPORT's Jim White on Tuesday morning, he explained: "I got a call late afternoon, early evening yesterday from Celtic from Dermot Desmond, and Dermot asked me would I step in because Brendan had resigned from the football club. Martin O'Neill BACKS Hearts To Win The SP

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