The Red Devils, per The Mail, have very keen interest in 17-year-old Porto winger Goncalo Sousa.
The winger was making his first team debut, as he came on in the 83th minute of the win against Chaves.
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Sousa may not be ready for the Premier League as yet, but United want to steal a march on other teams.
He shone recently in the UEFA Youth League, while he is expected to get a lot more game time at senior level next season.
Whether he is one United sign for the present or loan him out after securing his signature is not yet clear.