West Ham chief Sullivan: Diego Poyet can be world class
Poyet signed for West Ham on a free transfer from Charlton Athletic.
Sullivan told whufc.com: "Poyet could be a world-class player within 12 or 18 months. Whether he's ready now or needs six months, I don't know.
"People at Charlton tell me he's their best young player in the history of Charlton."
For the big stories and the banter follow us on Twitter: @tribalfootball