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French main referee Ruddy Buquet (R) gestures as he speaks with Metz's Cameroonian midfielder Georges Mandjeck (C) and Guingamp's French forward Yannis Salibur (L) during the French L1 football match EAG Guingamp against FC Metz on May 20, 2017 at the Roudourou stadium in Guingamp, western of France. / AFP PHOTO / FRED TANNEAU (Photo credit should read FRED TANNEAU/AFP/Getty Images)

French main referee Ruddy Buquet (R) gestures as he speaks with Metz's Cameroonian midfielder Georges Mandjeck (C) and Guingamp's French forward Yannis Salibur (L) during the French L1 football match EAG Guingamp against FC Metz on May 20, 2017 at the Roudourou stadium in Guingamp, western of France.  / AFP PHOTO / FRED TANNEAU        (Photo credit should read FRED TANNEAU/AFP/Getty Images)