Southampton's Sadio Mane was forced off after 25 minutes in their Premier League clash with Watford on Sunday.
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Mane Injured in Watford Clash
Sunday, August 23
The news was confirmed by Southampton's official Twitter feed, which provided minute-by-minute updates of the match.
In light of Manchester United's reported interest in the winger, the Daily Mail's Sam Cunningham tweeted: "Mane off down the tunnel now. End of his game. [Ronald] Koeman hoping for a 10-day injury."
However, Sky Sports reported the injury as being a concussion, making it unlikely to be an issue should United pursue the 23-year-old before the end of the transfer window.