Southampton manager Ronald Koeman has said that he feels "let down" by some of his players following their 1-0 defeat to Norwich City this afternoon.

Alexander Tettey scored the only goal of the game shortly after Victor Wanyama had been sent off for a second bookable offence, while Sadio Mane was dropped from the starting lineup altogether for disciplinary issues.

Koeman openly criticised Mane for his actions, and also admitted to being "angry" at Wanyama for earning himself a second yellow.

"I feel let down by some players, yes of course - because we had a different lineup for the game. Sadio was in to start but we have rules in the team and he did a big mistake before the game in our last meeting. He came late and that's impossible. Everybody knows that we have a sanction - you don't start. So then you have to make changes in the team, changes to all the set pieces, everything," he told reporters.

"I don't understand it. I don't understand a player that comes in late to the last meeting. You will have to ask him why. I don't know. I didn't ask - otherwise then you get into details and it is already too late. My message to Sadio two days ago in training was that I didn't think he was really focused and concentrated. Yes I feel let down by him, but it's felt much more by his teammates because we are a club where we like to treat everybody very respectfully and you have responsibilities as a player, to the fans, to your teammates, to your board, to the technical staff.

"We had a great talk from our chairman on Friday about the club, the team, about the respect, the ambition, the spirit, focus, concentration. And then this happens. Also I'm angry about the second yellow card from Victor because a player with his experience needs to know if you already have a yellow in a game, that you cannot do that tackle in that position on the pitch.

"I agree that we were the dominant team, that we had the best chance in the game when Shane Long was put through, and we played some good football. But it's so unnecessary what happened because with 11 against 11, still we are stronger than we showed here and we know we are in a difficult situation. I'm angry about players who are not focused and concentrated on the club. That's my worst disappointment of the day."

Southampton have now lost six of their last eight league games to sit 13th in the table, just one point above Norwich.