A woman was arrested after unrest broke out during a match last Sunday.
Goytre Women’s FC were playing Tonyrefail when witnesses said a visiting player was assaulted and knocked unconscious.
A red card was brandished to a Tonyrefail player and an ambulance summoned to take the injured woman to hospital as the referee called the game off.
South Wales Police said a 25-year-old woman from Tonyrefail was arrested on suspicion of assault and was bailed pending further inquiries.
The South Wales Football Association was investigating.
A spokesperson for Tonyrefail Welfare Ladies said: "The whole club is saddened by this event, and we would like to send our best wishes to those who have been affected by this incident."
Wye Valley bridge closure sparks fear residents are being ‘fobbed off’
Planned strike postponed at Monmouthshire school
Usk named Best Place to Live in Wales
Creative hub planned for former estate agent’s office