A 17-year-old Valencia fan has begged for forgiveness after throwing a bottle at Barcelona players in Los Che's recent 3-2 defeat to the Blaugrana, but he accused Neymar of provoking the Mestalla Stadium crowd.
Messi's stoppage-time penalty against Valencia saw Barca earn all three points from a hotly contested La Liga match, and in the ensuing celebrations a water bottle was thrown into the visitors' huddle, appearing to strike Neymar and Luis Suarez.
Valencia have been charged €1500 (£1341) by the Spanish football federation because of the incident and warned that future problems could force them to play games behind closed doors, per Conrado Valle of AS.
The committee did concede a level of "over-exaggeration" from Barcelona players, however, and mentioned that Valencia acted "in an exemplary manner in dealing with the aftermath of the incident in identifying the perpetrator," according to Valle.
In a letter written to 99.99 Valencia Radio, a young fan has taken responsibility for throwing the bottle but explained he thought Valencia's fans were provoked and Barca players faked being hit by the missile, per Football Espana:
I am the supporter that threw the bottle, yes, the one that hit the Barcelona players. From the moment it left my hand, I realised the seriousness of my mistake.
I completely regret it, as it isn't an act that defines me as a person, nor does it define Valencia's great fan-base.
When the penalty was given, I felt very impotent and upset at what had just occurred. When Messi scored and came to the north end to celebrate, I also saw how Neymar insulted and provoked all of those Valencia supporters that had supported the team until the end.
At that moment, I saw a bottle lying on the ground, and on impulse picked it up and threw it at them.
It was a water bottle, despite being practically empty, was enough for not just one but up to five Barcelona players to feign contact.
I ask Barcelona for forgiveness and also to my lifelong team, who I will continue to support until the end of my days.
Struggling Valencia looked to have claimed a point against the Catalan giants on Saturday despite surrendering a 2-1 lead when Suarez equalised in the 62nd minute.
However, Messi's goal from the spot in the dying moments condemned them to their sixth loss of the season—from nine matches—and Barca's enthusiastic celebrations were not well received by the hosts.
Fan footage showed the aftermath of the penalty:
Aside from the latest accusations of incitement, Valencia captain Dani Parejo also recently said Barcelona's players were wrong to celebrate as they did and said "they lacked respect," per Spanish outlet La Sexta (via AS).
It was a match contested amid a fiery atmosphere, with Valencia regularly angered by decisions that went against them.
It was the sixth win of the La Liga season for Luis Enrique's Barca but came at a cost, as Andres Iniesta picked up a knee injury under a challenge from Enzo Perez that will see him miss a significant chunk of the campaign:
Valencia's next league game is away to Deportivo La Coruna on Monday, while Barcelona host Granada on Saturday.