Tottenham said Rodrigo Bentancur (27) was "conscious" after the Uruguay midfielder was taken to hospital following his concerning injury in Wednesday's League Cup semi-final first leg against Liverpool.
Bentancur stooped to head a corner after seven minutes at the Tottenham Hotspur Stadium and stayed on the ground after falling unchallenged.
His teammates showed immediate concern and play was stopped as Bentancur received medical attention for nine minutes before he was replaced by Brennan Johnson.
The midfielder was given oxygen through a mask during the treatment as a hush fell on the capacity crowd.
Tottenham moved to ease fears over Bentancur, who only recently returned from a seven-game ban.
"We can confirm Rodrigo is conscious, talking and will go to hospital for further checks," the club said in a statement on X during the half-time interval.