Generally speaking, the arbitration is submitted to a panel of three arbitrators.
Under the ordinary procedure, each party chooses one arbitrator from the CAS list, then the two designated arbitrators agree on who will be the president of the panel. Failing such agreement, the President of the Ordinary Arbitration Division makes this selection instead of the two arbitrators.
Under the appeals procedure, each party chooses an arbitrator, and the president of the panel is selected by the President of the Appeals Arbitration Division.
If the parties agree, or if the CAS deems this appropriate, a sole arbitrator may be appointed, depending on the nature and importance of the case.
The arbitrators must be independent, that is to say have no particular connection with any of the parties, and must not have played any role in the case in question.