Olympic swimmer Ryan Lochte of the U.S speaks at a news conference at an event to unveil the new line of Speedo LZR Racer X swim suits in the Manhattan borough of New York City, U.S. on December 15, 2015. REUTERS/Mike Segar/File Photo

People raise "Estelada" flags (Catalan separatist flag) before Champions League group E soccer match between Barcelona and Bate Borisov at Camp Nou stadium in Barcelona, Spain, November 4, 2015. REUTERS/Albert Gea

John Carlos, participant of the 1968 Olympics, stands on the campus track at Palm Springs High School, where he is a teacher and counsellor in Palm Springs, California July 11, 2012. Picture taken July 11, 2012. REUTERS/Alex Gallardo

Stan Wawrinka of Switzerland, winner of the 2016 U.S. Open tennis tournament poses with the trophy in Manhattan, New York, U.S., September 12, 2016. REUTERS/Tony Pyle

Stan Wawrinka of Switzerland, winner of the 2016 U.S. Open tennis tournament poses with the trophy in Manhattan, New York, U.S., September 12, 2016. REUTERS/Tony Pyle

Britain Soccer Football - Arsenal v Southampton - Premier League - Emirates Stadium - 16/17 - 10/9/16 Arsenal's Lucas Perez Action Images via Reuters / John Sibley EDITORIAL USE ONLY. 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. Please contact your account representative for further details. - RTSNDMV

Liverpool's Mario Balotelli. Football - Hull City v Liverpool - Barclays Premier League - The Kingston Communications Stadium - 28/4/15. Reuters / Andrew Yates

Barcelona's coach Luis Enrique attends a news conference. Football Soccer - Barcelona training - Champions League - Joan Gamper training camp - Barcelona, Spain - 12/09/16. REUTERS/Albert Gea