Sunderland will be eager to bolster their frontline before their Championship opener against Cardiff City. Sunderland are set to face stiff competition to keep hold of Jack Clarke this summer, though the winger is yet to receive any bids for his signature. With Southampton reportedly put off by his valuation, the Black Cats could be offered the chance to keep him, but will look to bring in some attacking reinforcements either way. The Wearside outfit struggled for goals and creativity last term and have since been linked with a number of wingers to help them out next time round. READ MORE: Cry…