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NEWCASTLE UPON TYNE, ENGLAND - JULY 28: Aleksandar Mitrovic strikes the ball during his first training session during the Newcastle United Pre-Season Training session at The Newcastle United Training Centre on July 28, 2015, in Newcastle upon Tyne, England. (Photo by Serena Taylor/Newcastle United via Getty Images)

NEWCASTLE UPON TYNE, ENGLAND - JULY 28:  Aleksandar Mitrovic strikes the ball during his first training session during the Newcastle United Pre-Season Training session at The Newcastle United Training Centre on July 28, 2015, in Newcastle upon Tyne, England. (Photo by Serena Taylor/Newcastle United via Getty Images)