Great Britain captain Kate Walsh spent the night in hospital after being hit in the face with a stick during the 4-0 win over Japan yesterday.
The 32-year-old from Withington, the team's most experienced player, walked off late in the game holding the left side of her jaw and with blood coming from her mouth.
She was immediately taken away to be assessed by medical staff and was kept in overnight.
Team GB will give a further update on her treatment and prognosis at 2pm.
Walsh is a key part of Danny Kerry's side because of her experience and leadership - she has won 288 caps since making her debut in 1999 and has been captain for nine years - and her partnership in defence with Crista Cullen is the platform on which GB are built. She is also a useful option at penalty corners.