Henriquez was handed his debut as a half-time substitute in Saturday's 1-1 FA Cup draw with League One Bournemouth. And he certainly provided Ernie Howe's men with something to think about, heading against the crossbar within minutes of his arrival and unsettling the visitors' defence with his pace.
Indeed, given his desire to peel off the last defender, it was easy to make comparisons with a present United star, Javier Hernandez.
At just 18, the Chile international clearly has much developing to do. But Martinez has already seen enough to believe Henriquez's stay at Wigan will be a successful one.
"There is such a freshness about his play," said the Wigan boss. "Angelo's movement was outstanding and his knack of getting a couple of yards in the box gave him a very good chance, which nearly brought him his first Wigan goal.
"I have a feeling he is going to be a real crowd favourite."
He looks like being a useful stand-in for Arouna Kone, who has now left for African Nations Cup duty with the Ivory Coast and is unlikely to be in Wigan colours again until the middle of next month.
"Angelo tries to be very clever," said Martinez. "Because he is not the most physical, he avoids 50-50 contact with defenders. But his running into space is really sharp and incisive.
"We do need to get to know him a little bit better. Sometimes he made some great moves and we couldn't see him. But he will give us a completely different dimension.
"His attitude is incredible. He is a young man with great standards who is desperate to be successful in the Premier League."