Sunderland captain Corry Evans is "OK" after being knocked unconscious in Saturday's 3-3 draw with Wycombe Wanderers in League One.
Evans was stretchered off following lengthy treatment after colliding with his own goalkeeper Anthony Patterson.
"He's OK, he was knocked out," said Sunderland boss Lee Johnson.
"I am not sure where we stand with concussion protocols but there's no fractured neck or anything like that which is good to hear."
The Northern Ireland midfielder, 31, received treatment for eight minutes after coming together with Patterson while trying to clear the ball.
Johnson added: "It was a brave challenge and one he has got to make because it was important, but it is good news [he is uninjured].