2016 Rio Olympics - Canoe Slalom - Training - Whitewater Stadium - Rio de Janeiro, Brazil - 03/08/2016. Sebastian Maximiliano Rossi (ARG) of Argentina trains. REUTERS/Ivan Alvarado

Rio Olympics - Canoeing - Deodoro - Rio de Janeiro, Brazil - 02/08/2016. Jose Carvalho (POR) of Portugal trains. REUTERS/Sergio Moraes

Manchester City - Pep Guardiola Press Conference - City Football Academy - 8/7/16 Manchester City manager Pep Guardiola during the press conference REUTERS/ Phil Noble

Russian Olympic Committee (ROC) chief Alexander Zhukov attends a news conference ahead of Russian Olympic team departure to Rio 2016 Olympic Games in Moscow, Russia, July 26, 2016. REUTERS/Maxim Shemetov

Clients of CoSport, a firm that holds a U.S. Olympic Committee-granted monopoly to sell Rio 2016 events tickets, wait at a booth for information on where to pick up the tickets they purchased online, in Rio de Janeiro August 1, 2016. REUTERS/Ivan Alvarado

Clients of CoSport, a firm that holds a U.S. Olympic Committee-granted monopoly to sell Rio 2016 events tickets, wait at a booth for information on where to pick up the tickets they purchased online, in Rio de Janeiro August 1, 2016. REUTERS/Ivan Alvarado

Russia's Andrey Zamkovoy (R) fights Kazakhstan's Serik Sapiyev during their Men's Welter (69kg) semi-final boxing match at the London Olympic Games August 10, 2012. REUTERS/Damir Sagolj

Philippine boxing star and Senator Manny Pacquiao speaks during a news conference after being proclaimed by elections officials as one of the new members of the upper house of Congress in Manila, Philippines May 19, 2016. REUTERS/Erik De Castro