Boro will not be permitted to take part in the hearing brought by the EFL over Saints' alleged spying at their Rockliffe Park training ground last Thursday in the build-up to the first leg of their play-off semi-final at the Riverside.
They describe the conduct as going against "sporting integrity and fair competition" and believe that a sporting sanction is the only fair outcome.
Southampton beat Boro in extra-time in the second leg to reach the final on 23 May against Hull City - but that may have to be rescheduled depending on the outcome of this hearing.
