A banner calling on Manchester City owner Sheikh Mansour and the club’s fans to help free a human rights activist was flown over the Etihad Stadium on Saturday.

A plane carrying the banner ‘UAE: Free Ahmed Mansoor’ circled over the ground early on in the Premier League fixture between City and Liverpool.

Human rights campaign group Amnesty International organised the flyover and is calling on the United Arab Emirates authorities to act. Sheikh Mansour is the country’s deputy prime minister.

Amnesty also wants City fans to “see the bigger picture” and join the campaign to free Ahmed Mansoor.

He was sentenced to 10 years’ imprisonment in the UAE in 2018 and Amnesty says he has been kept in an isolation cell throughout his sentence so far and forced to sleep on the floor.

Mansour’s Abu Dhabi United Group took over City in 2008, a move which has led to a transformation in the club’s fortunes.

The club secured a Premier League, Champions League and FA Cup treble last season.

Amnesty’s UK chief executive Sacha Deshmukh said: “The UAE has been sportswashing its global reputation through Manchester City while at the same time jailing Ahmed Mansoor and others simply for their peaceful human rights activism.

“Man City’s amazing success under Pep Guardiola owes a great deal to Emirati funding and we’re calling on City fans to join us in this campaign to free Ahmed.

“Today’s plane stunt is a way of saying, ‘Look up from the pitch and see the bigger picture – a huge injustice has occurred, and the owners of Man City are the ones who can right this wrong’.”

Other human rights campaign groups have written to Manchester City Council this month, calling on it to ask the UAE government to release Mansoor.

“Manchester City Council has a deep and long-standing relationship with entities controlled by individuals operating in leadership roles within the highest echelons of the UAE government, which places upon it a special responsibility to show support and solidarity with victims of repression by that government,” a letter to the council, dated November 13, said.

A second plane flew over the stadium in the second half of Saturday’s match, trailing a banner reading ‘Premier League = corrupt’ as part of a protest by Everton fans against the club’s recent points deduction.