Neymar's father has claimed Manchester United offered Barcelona €190 million ($295 million) to sign the Brazil captain in the off-season.

Reports in August claimed the Premier League club was prepared to meet Neymar's buyout clause, a figure that would make the 23 year-old the most expensive player ever had he opted to leave.

The former Santos forward remained at Barca, though, and has again shone alongside Lionel Messi and Luis Suarez as Luis Enrique's men seek to defend the treble of La Liga, Copa del Rey and UEFA Champions League they won last term.

Neymar's father on Friday (AEDT) gave an interview to a radio station claiming Louis van Gaal's Red Devils did indeed attempt to prise the Selecao talisman away from Camp Nou.

"Man United is the side that offered €190m for Neymar [to] move," he told Esports Cope. "He has still two years of contract ... you all can be calmed as my son is so happy here."

Neymar appeared in a Spanish court on Wednesday (AEDT) to testify over allegations of fraud brought by Brazilian investment fund DIS in relation to his transfer to Barca in 2013.

The Sao Paulo public prosecution office (MPF) in Brazil meanwhile have recommended Neymar, Neymar Sr, Barcelona president Josep Maria Bartomeu and his predecessor Sandro Rosell are charged over alleged tax evasion relating to the move from Santos.

"We are calmed and optimistic," Neymar Sr added.

"We are just telling the truth."

No formal charges have been brought in the Spanish investigation, while Neymar, Neymar Sr and Barcelona have all denied any wrongdoing in both cases.