Clarkson became embroiled in a racism controversy after a tabloid published a clip of him apparently using the N-word while reciting the nursery rhyme "Eeny, meeny, miny, moe" during filming. The clip, recorded several years ago, was never broadcast.
Clarkson initially denied using racist language. But he later said he "mumbled where the offensive word would normally occur" despite trying not to, and that he was mortified by the mistake.
The BBC said Friday it is taking the incident seriously.
Clarkson, a household name in Britain, had previously sparked complaints with allegedly racist comments about people from Mexico and Asia.