Luis Sinisterra officially departed Leeds United for Bournemouth permanently yesterday. Sinisterra had been on loan at the Cherries since deadline day last summer and after a slow start to his career on the South Coast, has started to become more of a key player in recent months. Bournemouth had already agreed an option-to-buy upon the completion of his loan move, though it would only become active if Leeds failed to get promoted back to the Premier League. Instead, they have looked to move early to anticipate any potential competition from the likes of AC Milan, agreeing to pay a guaranteed f…