A memorial stone in a garden dedicated to former Newcastle and England manager Sir Bobby Robson has been defaced.
The garden was opened on Gallowgate, in Newcastle, close to St James' Park, in May last year.
Liz Luff, from the Sir Bobby Robson Foundation, said on Twitter that the council would be washing the "obscenity" off the stone on Monday.
The garden includes a series of stones featuring images to celebrate Sir Bobby's career.
Of the graffiti, Ms Luff tweeted: "I can't believe someone would do that."
The foundation was set up in 2008 and works with scientists at Newcastle University to help develop cancer treatments.
Sir Bobby died in July 2009 aged 76 after a long battle with cancer.
The garden was opened on Gallowgate, in Newcastle, close to St James' Park, in May last year.
Liz Luff, from the Sir Bobby Robson Foundation, said on Twitter that the council would be washing the "obscenity" off the stone on Monday.
The garden includes a series of stones featuring images to celebrate Sir Bobby's career.
Of the graffiti, Ms Luff tweeted: "I can't believe someone would do that."
The foundation was set up in 2008 and works with scientists at Newcastle University to help develop cancer treatments.
Sir Bobby died in July 2009 aged 76 after a long battle with cancer.