Sunderland have a number of players attracting summer transfer interest, as well as key man Jack Clarke. Clarke was once again at the centre of transfer speculation in January, with Lazio, Crystal Palace, and West Ham all closely linked with the 23-year-old. Now, it seems inevitable that the former Leeds United and Spurs man will leave the Stadium of Light this summer, unless of course the Black Cats can earn promotion to the Premier League. Failure to do so would almost guarantee Clarke’s exit, and it could also prompt two more of Michael Beale‘s players to leave; Dan Ballard and Dan Neil. Mi…