Spanish football club Sevilla have urged LaLiga to take action after a fan touched winger Lucas Ocampos "inappropriately" during their 2-1 victory at Rayo Vallecano, the club said on Tuesday.
The incident took place 33 minutes into Monday's match when a fan poked Ocampos, while he was taking a throw-in, from behind. The Argentine immediately notified the referee about what had happened before joining the match again.
"We would like to place on record our disgust at the incident," Sevilla said in a statement.
"Lucas Ocampos was subjected to an obscene and completely inappropriate act by a home fan. We hope that the appropriate measures outlined in the regulations will be taken to prevent such behaviour from happening again on a football field, and we have expressed this to LaLiga directly."
Rayo Vallecano said that they were working to identify the fan while also stating that the incident went against their values as a football club.
"This isolated action is solely the individual responsibility of the fan who carried it out," the club added.
"Rayo Vallecano is currently working to identify the fan so that, if he is a season ticket holder of the club, the appropriate disciplinary measures can be taken in accordance with the internal regulations."
Ocampos said he wanted the league to treat the incident "as seriously as it takes racism and these things".
"I kept my calm because I have two daughters, I hope this doesn't happen to them in the future," the 29-year-old told broadcaster Dazn.