Manchester United are interested in 16-year-old Benfica forward Umaro Embalo, Press Association Sport understands.
Jose Mourinho's men secured a narrow 1-0 win against the Portuguese giants at the Estadio da Luz in the Champions League on Wednesday evening.
MATCH REPORT: Benfica 0-1 Manchester United: Red Devils win ugly in Champions League
Earlier in the day, United went toe-to-toe with Benfica's Under-19s in the UEFA Youth League, with the feisty encounter ending 2-2 at the Caixa Futebol Campus.
Javier Ribalta, one of United's chief scouts, was among the interested observers in Seixal, where Embalo came on as a 65th-minute substitute.