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Celtic manager Martin O'Neill will announce that he is leaving the club on Wednesday, BBC Sport has learned.
O'Neill's wife Geraldine is ill and it is thought that the 53-year-old will stand down after Saturday's Scottish Cup final to look after her.
His assistants John Robertson and Steve Walford will also depart the club.
Stilian Petrov admits it will be a difficult experience to see Martin O'Neill leave Celtic if, as expected, he steps down following the Scottish Cup final.
O'Neill is widely anticipated to call it a day at Celtic Park as he takes a break from football to care for his sick wife at the end of the season.
Such a move would bring down the curtain on a special relationship with the club and fans after he has brought them three SPL titles and to the brink of European glory in the Uefa Cup final.
Martin O'Neill has confirmed he is stepping down as Celtic manager with Gordon Strachan replacing him at the helm.
The Northern Irishman's future has been the subject of intense speculation in the last few days.
O'Neill is understood to be quitting his role at Parkhead to look after his ill wife Geraldine.
"It has been a long haul but the fans have been fantastic,'' O'Neill told BBC Scotland. ''Seville proved that.
"They behaved themselves with 80,000 descending on the city.
''They have done a lot for me. It was a brilliant effort by the players and we deserved to win it.
"But, like last week, we couldn't put the game away. The players have been a terrific bunch for a long, long time.
"It was one final effort. We missed some great chances to wrap the game up.
"As we found to our cost last week, one-nil is never enough and Dundee United hit the bar towards the end but that would've been harsh on us at the end.''
"The torch has passed to Gordon. He is a different personality to myself,'' concluded O'Neill.
"He knows the game inside-out and just needs a wee bit of luck.
"He also needs a bit of time, which will be very important and he will stamp his authority right through the football club."
Robbie Keane is refusing to rule out a possible move to Celtic.
The Tottenham striker has been linked with a switch to Parkhead with incoming Bhoys boss Gordon Strachan reported to be keen on working with Keane again after their time together at Coventry.
Keane's future at White Hart Lane looks uncertain with the player unable to hold down a regular place in the side.
"I am free to go for nothing in this transfer window. If Bayern come back and say they want me to sign then I will go for free.
"The manager of Bayern said he was interested in me and they are one of the best clubs.
"To be honest, I have language books in my bag - English, Spanish, French, Italian and German."