Former Scotland striker James McFadden on BBC Sportsound

Celtic looked so comfortable at times it was like a training session.

The reaction to going a goal behind, given they don’t win many games away from home in Europe, was excellent.

Overall that was as good a Celtic performance away from home in Europe that I’ve seen.

The players will be shattered, but what a performance from them.

BBC Sport Scotland chief sports writer Tom English

I can understand Celtic wanting to look to the future, but maybe the obvious solution is staring them in the face.

With the group of players that was really struggling in the latter weeks and months of Brendan Rodgers’ reign, Martin O’Neill’s got a big win on the road in Europe on the big stage. They don’t do that very often. And he’s done it on his second attempt.

It just shows you the magnetism of the man. Even though he’s 73 and he hasn’t done it for a number of years, he’s still got it.

Journalist Moira Gordon on BBC’s Scottish Football Podcast

If not quite the swagger of Celtic of old, O’Neill has certainly brought back a bit more belief, a bit more positivity around the place, even in the dressing room, and you see it in the way the team are playing and approaching games.

Bizarrely he’s probably putting a bit of extra pressure on the new guy coming in. They’ve seen what Martin can do, seen a wee bit of growth.

The new guy’s going to have to come in and maintain that upward trajectory. If not, people will be suddenly be calling for Martin to come back again.