Nottingham Forest midfielder Danilo has suffered a broken ankle, boss Nuno Espirito Santo has confirmed.
The 23-year-old fell badly on his left leg when challenging Antoine Semenyo after just six minutes of Saturday's 1-1 draw with Bournemouth at the City Ground.
Danilo had nine minutes of treatment on the pitch and was taken to the Queen's Medical Centre in Nottingham. He will be assessed further on Sunday.
"It was a horrible moment for everybody, he has broken his ankle," said Nuno.
"It's serious, we are going to miss him, not only on the pitch.