LONDON (AP) _ Paul McCartney fears grief over his wife's death may prevent him from performing live ever again, a tabloid reported Friday.

``I might not be able to get up on stage again,'' he told The Sun. ``I don't know whether I can go up there and sing, thinking about Linda.''

McCartney said Chrissie Hynde of the Pretenders invited him to participate in a series of concerts next year to highlight his late wife's crusade for animal rights.

The ex-Beatle said he will ``play it by ear. If I can manage it, then I will. But I've said that if I can't do it, she'll just have to forgive me.''

McCartney said he carries his wife's wedding ring in his pocket. She died in April after a long battle with breast cancer.