Neymar could face punitive action from his French club, Paris Saint Germain, after he failed to turn up for the first day of the club's pre-season training on Monday.
The French champions in reaction say, they will take "appropriate action" against the Brazil star who was expected back for the pre-season.
Injured, the 27-year-old star missed being named in Brazil's squad for the Copa America tournament which they won on Sunday.
Neymar Jnr got injured playing for Brazil against Qatar in an international friendly
A statement from the Paris club read: "Paris St-Germain notes that Neymar Jnr was not in attendance at the agreed time and place. This was without the club's prior authorisation. The club regrets this situation."
Thee club did not indicate if they had received any prior notice from the player that he would be late in reporting for the pre-season.
Brazilian media quoted Neymar's father, Neymar Snr, as saying that PSG "were aware" that the forward was set to miss training on Monday because of charity commitments.
"The reason was known and planned for a year as part of his activities for the Neymar Institute," he told Fox Sports Brazil.
"We couldn't postpone them and he will return [to PSG] on July 15."
PSG president Nasser Al-Khelaifi poses with Neymar at his unveiling
Neymar joined PSG from Barcelona for a world record €222m euros in August 2017.
He has scored 34 goals in 37 league appearances to help them to consecutive Ligue 1 titles and on his first season, was adjudged the Best Ligue 1 Player.
Neymar won the Ligue 1 Best Player Award at the end of the 2018 season
The Brazil star has also been involved in a number of disciplinary incidents, including being banned for three games for lashing out at a fan after PSG's shock French Cup final defeat.
He will also miss the next three European matches for insulting officials.
The former Santos forward was stripped of the Brazilian captaincy in May before suffering an ankle ankle injury during an international friendly against Qatar last month that forced him to miss his country's Copa America triumph on home soil.
Last week, Barcelona president Josep Bartomeu claimed that Neymar wants to leave PSG this summer.
According to reports in the Spanish media, Neymar has even offered to take a pay cut of 12m euros a year in order to facilitate a return to the Nou Camp, where he played between 2013 and 2017.