Martinez reveals Man Utd striker Henriquez already training with Wigan
The 18-year-old Chile international has already trained with Wigan and Martinez believes he can bring a much-needed cutting edge up front.
The Latics boss said: "Angelo Henriquez is a goalscorer. He's going to be a top player, he's an out-and-out finisher and he can bring us goals.
"He comes in straight away to a very familiar dressing room with (Chile team-mate) Jean Beausejour and we're very excited to see Angelo developing as a player and help him to get to where he deserves to be, which is competing for a place at Manchester United."