Sevilla defender Fernando Navarro was snapped urinating inside a bottle while on the bench of the club's weekend 3-0 victory over Elche.
A video shows Navarro grabbing an empty bottle before holding a jersey over his waist, with the help of striker Carlos Bacca, who had been taken off after scoring twice for his team.
Sevilla are four points behind fourth-placed Atletico Madrid in the Spanish league, with eleven games remaining in the season.