Porto sign Guarin

FC Porto have signed Colombia's Fredy Guarin on a four-year deal from French first division side Saint-Etienne, the selling club's website said Friday, without giving further details.
Midfielder Guarin, 22, failed to make an impression in France, scoring only once since his arrival from Argentina's Boca Juniors in season 2005-6.
Portuguese international starlet Paulo Machado has made a move in the opposite direction, joining the French club on a year-long loan deal.