Bournemouth midfielder Andrew Surman could miss the remainder of the season with a medial knee ligament injury.
Surman, 30, was forced off at half-time during their goalless draw against Southampton on Saturday after colliding with Saints goalkeeper Fraser Forster.
"They can be quite nasty injuries, depending on the area and how big the damage to the ligament is," manager Eddie Howe told BBC Radio Solent.
"Whether it's a season-ending injury, we're not quite sure at this moment."
Bournemouth, unbeaten in their past four Premier League games, travel to Liverpool on Wednesday.