He said: "I didn't see what happened but we hope it's nothing too serious as he's been fabulous over the last eight or nine games.
"It could be ligament damage but we will know more in a day or two."
Manchester United and Southampton go head to head in the EFL Cup final on Sunday - 41 years on from Saints' most famous day.
Manchester United v Southampton - Jose Mourinho's well-drilled machine versus the constantly regenerating upstarts.
The latest gossip and rumours from the newspapers and online:EDEN HAZARD has been engaged in months of secret talks with
Leicester have sacked manager Claudio Ranieri nine months a stunning Premier League title success last season.
Leicester have sacked Claudio Ranieri as they face up to a relegation battle just nine months after their stunning Premier League title.
Leicester's euphoria at winning the league last season has evaporated, with Claudio Ranieri leaving the club.