Manchester United striker target Ricky van Wolfswinkel believes he's improved as a player since moving to Portugal.
The Sporting Lisbon starlet moved to Portugal from FC Uterecht in the summer, but has already been attracting interest from clubs across Europe since the switch.
Mike Phelan, Manchester United assistant manager, confirmed the club have been tracking the player's progress for some time now, and Van Wolfswinkel believes he's become even better after his switch.
"I came to Portugal eager to improve my football at all levels. I am now much stronger physically," said the player.
"The competition in Portugal is much more intense, and I always have to be at my best."
Van Wolfswinkel is one of a number of players the Red Devils are thought to be tracking, with Serbian winger Milos Krasic also being watched by Manchester United over the past two years, according to his agent.
It's the 22-year-old Dutchman who is likely to excited Manchester United fans most though, with international recognition bestowed on the youngster last summer in a friendly match against Ukraine.
His potential has clearly alerted Sir Alex Ferguson over a move to Old Trafford, although striking competition is fierce at the club, with Wayne Rooney, Dimitar Berbatov, Javier Hernandez, Danny Welbeck and Michael Owen all vying for chances in the Manchester United first team.
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