RANGERS' director Chris Graham has resigned in the wake of a police and club investigation into a sexually explicit cartoon of the Prophet Muhammad he is alleged to have tweeted.

Rangers confirmed that the fans leader who had become an non-executive director had stepped down.

A club statement says: "Chris Graham has tendered his resignation as a Director of Rangers International Football Club (plc). This has been accepted by the Board."

Graham, who had been a non-executive director just 24 hours when claims he sent a tweet of Muhammad engaged in a gay sex act to a radical Islamist preacher were revealed, is also facing a robust investigation by Rangers.

Scottish Muslim leaders had joined calls for Rangers to take action. One MSP called on the club to "accept their responsibility to set a positive example".

The fallout from the saga has also seen far-right groups, including the BNP, and former English Defence League leader Tommy Robinson attempt to gain political capital from it. Robinson called for Rangers fans to "bring Muhammad cartoons to games".

Mr Graham, who acts as Rangers Supporters Trust spokesman, is alleged to have sent the tweet to Anjem Choudary in the aftermath of the Charlie Hebdo shootings.

Part of the message sent from 38-year-old's account on Twitter and accompanying the drawing read: "You probably won't like this one...then."

Mr Choudary had previously tweeted that "freedom of expression does not extend to insulting the prophets of Allah, whatever your views on the events in Paris today".

Among other tweets allegedly sent from Mr Graham's account were sexual comments about Celtic chief executive Peter Lawwell, a description of former manager Neil Lennon as "the Lurgan bigot" and claims fans of the Parkhead club were behind the burning of the Rangers team bus.

In one blog, on ex-Rangers chief executive Charles Green's use of racist language, Mr Graham said: "Nobody associated with Rangers should be using that type of language. If a director of one of Europe's elite clubs had made such a comment they would have been sacked or forced to resign. Should Rangers be any different?"