Gordon Strachan revealed that it took him just "seconds" to make up his mind to take the manager's job at Celtic.
Speaking for the first time at Celtic Park, Strachan said: "I made the decision in seconds. This is a chance I just couldn't turn down.
"I'm proud to be asked to follow Martin O'Neill and I'm looking forward to the challenge with a world famous club."
Strachan, 48, will be assisted by Garry Pendrey, who was with him at Coventry and Southampton.
Former Scotland international Strachan is replacing O'Neill, who has stepped down to care for his seriously ill wife.
O'Neill had five years of success which culminated in Saturday's Tennent's Scottish Cup win over Dundee United.
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I have been working behind the scenes - with Martin's permission - cross-referencing his transfer targets
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Strachan is returning to the game following a 15-month break after he quit as Southampton boss.
"I said when I left Southampton, the next job, I wanted some excitement and this job has that," continued Strachan.
"Even my wife could tell that I was excited. You know when someone asks you that, it's right for you.
"It's something that I'm proud of because, God knows, it's a hard job to take over.
"Five years ago if you'd have asked me, I would have said I wasn't ready for it but now I am ready for it."
Strachan made it clear that he would like out-of-contract Celtic stars Jackie McNamara and Neil Lennon to stay at the club.
He said: "They are both great examples of what it takes to do well at this club."
He also revealed that he'd spoken to striker Craig Bellamy, who has been a big hit while on loan at Celtic, and described those talks as "positive".
He then stressed he was not planning to make wholesale changes to O'Neill's side.
Strachan has signed a 12-month rolling contract
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"I think it was documented Martin was going to make changes and I will be following along the lines of Martin," Strachan added.
"I have been working behind the scenes - with Martin's permission - in the last two weeks, cross-referencing his transfer targets and players which I would like to bring in.
"There needs to be a turnover, a decent turnover. There has been a nucleus of seven or eight players over the last five years who need help."
Strachan is a former Aberdeen team-mate of Rangers manager Alex McLeish and has been in touch with his new Old Firm rival.
"I've spoken to him (McLeish) and I know how much pressure is involved. I know what I'm letting myself in for and it still doesn't deter me.
"It's unusual, I don't think the Old Firm have ever had such close friends as managers."