Norwich head coach Daniel Farke: "To concede two goals that quick in the second half was of course a defining moment in terms of confidence. We had setbacks we had to accept. The confidence was not there.
"It's important that you are effective. The situations before the two goals were ones you should not concede. We were just not willing enough to follow the movement."
Southampton manager Ralph Hasenhuttl: "The start was not perfect. We had a few problems in the beginning but after that we won more duels and had better aggression. That was the key.
"In the second half we were more clinical and it was a deserved win from a very fit team. Danny Ings is a fantastic finisher when he is around the box. He is working very hard for the team. The key was our work against the ball. When we are pressing together it is not so easy to play against us."
Conor McNamara, BBC Radio 5 Live commentator: "After this I don't think Norwich are going to be good enough to stay in the Premier League. They had early opportunities but no composure in front of goal and then the belief just evaporated.
"Second half - I don't think embarrassing is too strong a description."
Chris Sutton, former Norwich striker on BBC Radio 5 Live: "Norwich are down, I don't think there is any way back. It is the nature of the defeat too, Southampton were a different class.
"Where do Norwich go from here? It doesn't look good for them, very, very difficult after this result to even contemplate staying in the Premier League.