Martin O’Neill leads Celtic into Europa League action on Thursday admitting he still has nightmares about his last match in the competition with the club.

O’Neill, back in interim charge of the Hoops after Brendan Rodgers’ resignation last week, faces the stiffest test so far of his 10 days in charge, away against Danish side FC Midtjylland.

The 73-year-old comeback ‘kid’ has brought a feel-good factor back to the Bhoys with a morale-boosting 4-0 league win over Falkirk followed by Sunday’s rousing victory over Old Firm rivals Rangers to reach the Premier Sports Cup final.

He is under no illusions about the size of the task facing his side, however, with Midtjylland at the top of the standings with three wins from three, including one at Ange Postecoglou’s Nottingham Forest.

“This is massive, really, really big,” said the Northern Irishman, “They are a very, very good side, seriously, a really good team and they deserve to be where they are.

“So they’ve got nine points, it’s no surprise to me, although I didn’t realise how good they were until I saw them against Forest.”

O’Neill is synonymous with what was then the UEFA Cup after taking Celtic to the final in 2003, where they were edged...