The 74-year-old has since decided to stay, and won two out of three matches post-international break, culminating in the thrashing of Hearts last weekend.

"Every manager has a moment of doubt after a painful defeat where they question if they want to continue," former Celtic manager Strachan said. "But after stepping back and reflecting, Martin O'Neill realised how good the opportunity at Celtic is.

"People scrutinise body language, but managers process defeat in different ways. It's good to see Celtic respond with strong performances after the break.

"You can tell when a manager owns their interviews, and it was good to see Celtic play so well.

"Martin is the right man for the job."