Sandro Rosell stepped down from his role as Barcelona president on Thursday amid the ongoing row surrounding the club's signing of Neymar.
Josep Maria Bartomeu will replace Rosell for the remainder of his term in charge - which runs until 2016.
Reports in the Spanish media have claimed legal proceedings were to begin against Rosell regarding the deal to bring the Brazilian attacker to Camp Nou from Santos in the close-season.
The estimated €57million deal has come under scrutiny following allegations of a misappropriation of funds, while Spanish newspaper El Mundo Deportivo reported on Monday to have seen documents showing the deal was worth nearer €95m.
Rosell quickly refuted those rumours and said he would be happy to testify in court but, after a special meeting of the board of directors was called to discuss the matter on Thursday, the situation appears to have come to a head, with Rosell confirming a departure from his presidential role.
He bemoaned "attacks" upon him and his family in a press conference, which was delayed by almost an hour and a half.
He said: "For some time my family and myself have suffered threats and attacks in silence. These threats and attacks have made me wonder if being president means having to jeopardise my family.
"In recent days an unfair and reckless accusation of misappropriation has resulted in a lawsuit against me in the Audiencia Nacional.
"From the beginning I have said that the signing of Neymar Junior has been correct and his signing has caused despair and envy in some of our adversaries.
"The right of the club members to be informed needs to be compatible with the defence of the club and confidentiality of certain matters and facts. This confidentiality is essential in the world of football because otherwise the club could be damaged."
Rosell expressed great pride at the achievements at the club during his spell at the helm.
He continued: "In the last four years we have won one Champions League, one Club World Cup, two Ligas, one Copa del Rey, one European Super Cup, three Spanish Super Cups and one Copa Catalunya.
"In addition, our other professional teams have triumphantly paraded our colours around the world showing the character of our multi-sports club.
"Our global athletic leadership that began with Ronaldinho in the Paris final, and continued with Messi in Rome and London, was coupled with effective economic management, which allowed us to continue to be competitive, reduce our debt, restore and expand the club’s estate.
"In addition, we are proud that the best players in the world don our colours."
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