The Strange Logic of The Blades
West Ham say that a FIFA rule allows decisions of national football associations to be appealed to CAS. Sheffield United are arguing that the recent arbitration had nothing to do with the FA.
Sheffield United's stance is that the FA was not a party to the arbitration process and that the arbitration process was the outcome of a private dispute resolution process.
If this is just a private matter then presumably West Ham can just tell the Blades to do one.