Advocates of the ‘extended mind' - the claim that cognitive processes can and do extend outside the head - have generally had little to say on the metaphysics of mind, preferring to concentrate on the explanatory role which extended cognition can play in empirical cognitive science research. Recently, however, claims have been made about the relationship between extended cognition and traditional functionalism in the philosophy of mind. In this paper I explore these claims and suggest a way of clarifying the debate.