Sadio Mane’s Southampton future has been thrown into doubt after he was disciplined by manager Ronald Koeman then lambasted by the Dutchman for turning up late to a team meeting.

Manchester United are keen on the Senegalese attacker as boss Louis van Gaal has admitted he is short of forward options and will be monitoring Mane’s situation closely.

The player turned up late for a team meeting two hours before their match against Norwich and Koeman punished him by dropping him from the starting line-up.

Sadio Mane was relegated to the bench for Southampton's defeat by Norwich for being late for a team meeting

Ronald Koeman said Mane had disrespected his team-mates and the fans by turning up late

Koeman had already spoken to Mane about his lack of focus in a training session on Thursday and this latest incident suggests he is angling for a move in January.

The Southampton boss is undecided if he will fine the player further, but accused him of letting down his team-mates and the supporters after they lost in his absence.

‘We had a different line-up for the game,’ a clearly incensed Koeman said. 'He was one of the 11 players to start, but we have rules in the team. He has made a big mistake.

‘He came two hours late to our last meeting. That’s impossible. Everyone knows that we have sanctions and you don’t start.

‘Then you have to make changes in the team, you have to make changes in set pieces and everything.

The Southampton manager has also been unimpressed with the Senegalese forward's effort in training

‘I don’t understand the player who is coming late to the last meeting. My message to him on Thursday was I think he wasn’t really focussed and concentrated.’

Asked if he felt let down, Koeman replied: ‘Yes, but much more the players, his team-mates. We are a club that treats everyone with respect, you have responsibility, as a player, to the fans, to your team-mates, to the board, to the technical staff. And that’s very painful.’

This is the second time Mane has been disciplined for such an offence. He turned up late to a team meeting ahead of their home match against Liverpool last season.

Koeman was also disappointed with midfielder Victor Wanyama who was sent off in his side's 1-0 defeat

Koeman was particularly frustrated at Mane’s indiscipline just a day after chairman Ralph Krueger had addressed the players, on New Year’s Day, where he discussed the team’s spirit, respect, ambition and focus.

Victor Wanyama, who had a transfer request denied in the summer when Tottenham wanted him, was sent off for two yellow cards.