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Manchester City's Spanish football coach Pep Guardiola poses for photographs outside the Etihad Stadium in Manchester, northern England, on July 8, 2016. Pep Guardiola has warned his Manchester City players that they have to prove themselves all over again following his arrival at the club. / AFP / OLI SCARFF / RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR 'LIVE' SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read OLI SCARFF/AFP/Getty Images)

Manchester City's Spanish football coach Pep Guardiola poses for photographs outside the Etihad Stadium in Manchester, northern England, on July 8, 2016.

Pep Guardiola has warned his Manchester City players that they have to prove themselves all over again following his arrival at the club. / AFP / OLI SCARFF / RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR 'LIVE' SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS.        (Photo credit should read OLI SCARFF/AFP/Getty Images)