Click Manchester reports that United have been tracking Martinez for months and are now set to make a move for the striker
The Colombia international scored 26 goals in 30 league games for Porto last season.
Martinez is reportedly keen on a move to the Premier League.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.