Celtic manager Gordon Strachan said several players at the club had been affected by O'Donnell's death.
Soon after, Gordon Strachan's men doubled their lead with a fine solo goal from Samaras.
The former Netherlands international made his name at Feyenoord in the 1990s then joined Gordon Strachan's Coventry.
Tony Mowbray, Owen Coyle and Mark McGhee are among those still being considered to succeed Gordon Strachan.
He goes straight into Boro's boss Gordon Strachan's squad to face former club Sheffield United on Saturday.
Virgo was a surprise early signing by Gordon Strachan soon after he took charge at Celtic Park.
He returned to the club in a coaching capacity in 2008 to assist then manager Gordon Strachan.
The 45-year-old, who succeeded Gordon Strachan after leaving West Brom, said he would bring substance and style.
Across the city, Celtic have changed their management team with Tony Mowbray replacing Gordon Strachan at the helm.
Gordon Strachan was initially reluctant to call for the postponement of the fixture.
"I'm confident that we can continue to be successful as Gordon Strachan was and Martin O'Neill before him, " he said.
Hamilton's James McCarthy won the Young Player of the Year award, while Gordon Strachan was named Manager of the Year.
Then there was the bizarre approach to top level club manager Gordon Strachan, who he wanted to look after youth players.
And it was Gordon Strachan who won the signature of a player who had also been linked with Southampton, Derby and Leeds.
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Boro boss Gordon Strachan is a keen admirer of Osbourne and believes the player offers the steel his side has been lacking.
Celtic's goals came from two players who rarely featured under previous manager Gordon Strachan, former Hibernian striker Killen and Japanese midfielder Mizuno.
Several of McGhee's old Aberdeen team-mates have gone into management, with Alex McLeish and Gordon Strachan being the pick of the bunch.
BBC: SPORT | Football | My Club | Motherwell | McGhee out to make his mark
Boro's Gordon Strachan knows Miller, who has scored four goals in 22 appearances this season, from his time as manager of Celtic.
The versatile veteran played under Celtic manager Gordon Strachan while at Coventry City and can play in central defence or up front.
BBC: SPORT | Football | My Club | Celtic | Veteran Dublin signs for Celtic
He becomes the third Scottish Premier League manager to leave his post this week after Celtic's Gordon Strachan and Aberdeen's Jimmy Calderwood.
The match was played out against the contentious backdrop of Glenn Hoddle's possible return as Southampton boss to replace the departing Gordon Strachan.
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Gordon Strachan stepped down as manager last week after missing out on a fourth consecutive Scottish title, leaving coach Lennon a concerned man.
Celtic manager Gordon Strachan has now emulated his predecessor Martin O'Neill by winning back-to-back titles in his first two years at the club.
Previous Celtic managers Tony Mowbray, Gordon Strachan and Martin O'Neill were on one-year rolling contracts and are all believed to have had higher earnings.
Saints boss Gordon Strachan was left with five first-team squad players on Tuesday and Wednesday to prepare for Saturday's FA Cup match with Norwich.
Spells at Nottingham Forest and Wycombe Wanderers followed, before Lennon found himself back at Celtic with a coaching role in Gordon Strachan's backroom staff.
Speculation has been rife that the 42-year-old, who has overseen the club's rise to the Premier League, was ready to replace Gordon Strachan at Celtic.
The Republic of Ireland international has scored seven league goals for Gordon Strachan's side so far this season, including a hat-trick against Falkirk in December.
It was a far from convincing performance from Gordon Strachan's side but they will care little and all the pressure returns to the blue side of Glasgow.
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