Bournemouth midfielder Alex Scott suffered a fractured jaw from what manager Andoni Iraola described as a "very violent" elbow from Aston Villa's Tyrone Mings.
The 21-year-old midfielder went down in the sixth minute after being caught by Mings' right elbow in Saturday's Premier League defeat at Vitality Stadium.
Scott required lengthy treatment but continued to play, before going to ground again holding his face after an incident involving Amadou Onana, and was subsequently replaced at half-time.
Aston Villa were reduced to 10 men with 10 minutes to play when Jacob Ramsey was shown a second yellow card, but Mings did not receive a caution, to Iraola's dismay.