Usually used for a bad, sloppy or useless soccer player,
particularly because of the stiff (like a tree trunk) movement of their body. Examples of troncos are Diego Reyes, Maza Rodriguez , Kikin Fonseca and some even call Chicharito Hernandez a tronco because of his unorthodox ways of scoring goals. A tronco doesn't
necessarily mean that the player is
unsuccessful, Hernandez being the perfect example.