The only down side for the capital-based team was that Renato Augusto limped off with injury as the Brazilian was suspected of suffering a muscular problem.
The testing of players is mandatory in the Premier Leauge but not in the English Football League which includes Championship, League One and League Two.
Leo Messi will also be in the spotlight after a summer in which he asked to leave the Camp Nou, while the pressure will also be ramped up on Antoine Griezmann and Philippe Coutinho, who has returned following his loan to Bayern Munich.
Sport have secured three wins and a draw from their past five matches and are now 10th in the standings with 14 points, trailing Fluminense on goal difference.
Portu opened the scoring in the 55th minute from a tight angle after a pass from Mikel Merino, and Adnan Januzaj doubled the visitors' lead 13 minutes from time from the penalty spot after he had been clipped in the Elche area.
As the match progressed, Augsburg grew in confidence and opened the scoring against the run of play in the 40th minute when Caligiuri's pinpoint cross into the box found Uduokhai, who headed home.
"Obviously going into a different culture, a different country, I've had to grow up as a person, never mind a footballer," said Bale, whose time at Real Madrid turned sour over the past 18 months, with the press and fans turning against him after a continuing series of injuries.
Cazares, capped 21 times for Ecuador, has made 205 appearances and scored 41 goals for Atletico Mineiro since joining the Belo Horizonte outfit from Argentina's Banfield in 2016.
"Mainz will, from now on, always be the club where players refused to follow the coach's instructions and refused to train," Schroeder added.
MADRID, Sept. 23 (Xinhua) -- FC Barcelona on Wednesday confirmed the sale of Portuguese international right back Nelson Semedo to the Wolverhampton Wanderers for a fee of 30 million euros plus a possible 10 million more in incentives.
'The reason I like skiing is really simple.' says Zhang Yifan, 31, from Beijing. 'It's about meeting cheerful and interesting people you probably wouldn't meet in everyday life.'