Tooting MP Sadiq Khan has urged the UK Government to press their US counterparts to release Shaker Aamer from Guantanamo Bay after further allegations of physical and mental abuse.

Mr Khan has relayed his concerns to William Hague in the hope the Foreign Secretary will raise the matter with the US Secretary of State, John Kerry.

A report in the Independent newspaper last month suggested Mr Aamer had told his lawyer, in a declassified phone call, that he still faces "forced cell extractions" on a daily basis.

This is despite that fact that Mr Aamer, who has been held in the Cuban prison for more than 11 years, has never been charged with any offence.

Mr Khan said: "I remain extremely concerned for Mr Aamer’s welfare whilst he remains detained in Guantanamo Bay. These latest reports which come from him personally suggest that he is being mistreated on a daily basis"

"I hope that the Foreign Secretary will take these allegations of mistreatment seriously and bring Mr Aamer’s case to the forefront of the United States government’s mind so that we can begin to seek an end to his incarceration.

"We must remember that Mr Aamer has remained in prison, away from his family, for 11 years – and all the while never being charged with an offence, let alone being allowed his day in court.

"I will continue to push the Foreign Office to work with their US counterparts to ensure that there is a resolution to this case once and for all."

Before being an MP, Mr Khan was a human rights solicitor whose firm acted for some of the men held at Guantanamo Bay.

Since becoming an MP, Mr Khan has long campaigned on behalf of Shaker Aamer and his family for his safe return home to the UK and for the closure of Guantanamo Bay.

Mr Khan has lobbied both the Foreign Office and the Prime Minister on many occasions and attended demonstrations outside parliament.

The case is also of great interest to many of his constituents, which include members of Mr Aamer’s family.

In April 2013, a petition calling for Mr Aamer’s safe return to the UK received more than 100,000 signatures. As a result the issue was debated in Westminster Hall.

Mr Khan attended the debate to show his support for Mr Aamer and his family and was mentioned numerous times during the debate as being one of the MPs that has consistently campaigned on behalf of Mr Aamer.