The Argentine Primera Division is always a talent-rich hunting ground for football managers in the game. Highly-skilful, young players frequently appear for very decent prices, while their wages are rock-bottom. That's the perfect mould for a young player to come in, and Emanuel Mammana could be the next off the production line of homegrown talent. The 19-year-old centre back was called up to the full-Argentina squad before he'd even played a senior game for River Plate. He opposed the national side in a sparring team as a warm up, but impressed so much that he was called up to the top, a similar story to how Javier Mascherano started out. Arsenal and Juventus are circling, so get in quickly.