One Sunderland star is now a fresh doubt for Friday night’s clash against Hull City after suffering a knock in training. Sunderland have been hit with an injury crisis in recent weeks. As a result, calls to strengthen in the transfer window have grown louder. Michael Beale is under serious pressure to sign the right players and has a few positions he’d like to strengthen. A striker is imperative given the lack of goals scored by the Black Cats forwards this term. Kieffer Moore is on the top of their wish list with Beale needing a proven goalscorer at this level to help the youthful core of for…