Amnesty International has accused Manchester City’s owners of trying to “sportswash” their country’s “deeply tarnished image” by financing the success of the Premier League side.

The Premier League holders are owned by Sheikh Mansour, a member of the Abu Dhabi royal family and deputy president of the United Arab Emirates. German publication Der Spiegel has published a series of allegations based on the whistle-blowing Football Leaks series, many of which involve Manchester City. They were named as seven one of seven sides to alleged to be planning a breakaway European super league, and their financial conduct has been questioned.

Der Spiegel allege that City have been trying to ease around Uefa’s Financial Fair Play rules by inflating sponsorship deals and hiding contracts. Arabtec, the largest construction company in the United Arab Emirates, was one of the sponsorship deals mentioned, but the firm is no longer listed as one of City’s regional partners.

Manchester City are accused of avoiding Uefa’s Financial Fair Play rules (Getty)

Arabtec has repeatedly been criticised by Amnesty International for the way it treats migrant workers, and Der Spiegel claims that City ignored concerns raised by its own public relations experts ahead of signing a three-year regional sponsorship agreement in 2014, worth £7m a year.

“The UAE’s enormous investment in Manchester City is one of football’s most brazen attempts to ‘sportswash’ a country’s deeply tarnished image through the glamour of the game,” Amnesty International’s Gulf researcher Devin Kenney said.

“As a growing number of Manchester City fans will be aware, the success of the club has involved a close relationship with a country that relies on exploited migrant labour and locks up peaceful critics and human rights defenders.”

City have refused to comment on the allegations but said the reports are based on “hacked and stolen” material as part of a “clear and organised” attempt to tarnish the club.

Human Rights Watch and Amnesty International previously wrote to two senior figures in the Manchester council after being made aware of the council’s business links to the Abu Dhabi government. They asked them to ensure the commercial relationship did not “besmirch the city’s reputation” and urged them to support “victims of serious human rights violations.”

The City manager ,Pep Guardiola, said that he trusts his City’s conduct. “The club has made a statement on Friday about what happened, stolen emails. Of course I trust the club, what they have done,” he said.

“Of course we want to follow the rules. Uefa, Fifa and the Premier League, they do what they have to do. Believe me, I’m completely honest, I don’t know what happened, I’m a manager, focused on the pitch, the locker room.