A bottle was thrown on to the pitch at Mestalla as Barcelona celebrated Lionel Messi’s stoppage time winner over Valencia from the penalty spot in front of the home supporters.
Neymar and Luis Suarez were both hit by objects and fell to the pitch, leading Messi to confront the fans and pump his fist.
La Liga president Tebas said that the fact that objects were thrown in the direction of Messi, Neymar and Suarez makes the incident a serious matter which needs dealing with.
However, he said that Barca players were not without blame on Saturday.
“You have to go in order and the first and most serious thing is the bottle [incident],” he said at La Liga’s awards night on Monday.
“That’s the most serious thing which occurred, but some of the conduct from some of the players is not what I like [to see].”