Scotland Under-21 winger Ben Doak will be monitored by Liverpool after being forced off following a clash of heads in his side's Youth League quarter-final at Sporting Lisbon.
The 17-year-old clashed heads with defender Joao Muniz and after lengthy treatment was unable to play on.
"Ben is OK. He couldn't continue but our medical staff got to him quickly," said Under-19 manager Barry Lewtas.
"He was on the pitch at the end with the lads and we will keep him closely monitored."
Doak, who was named in the Scotland Under-21 squad for friendlies with Sweden and Wales last week, has enjoyed a breakthrough season at Anfield.