The 45-year-old, assistant manager Mauricio Taricco and first-team coach Charlie Oatway were all suspended by the Championship side following May's play-off semi-final defeat to Crystal Palace.
The League Managers' Association explained that the no-show was due to Poyet only recently returning from annual leave, thus giving the Uruguayan no sufficient time to prepare.
|BRIGHTON SUSPEND POYET
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"Also, it has repeatedly been made clear to the club that Gus's LMA representative, Richard Bevan was not available to accompany him today, but was available to attend on Thursday or Friday."
The Seagulls have no given Poyet "a final opportunity" to meet with the panel - an official statement read: "Following the completion of a detailed internal investigation, Gus Poyet's disciplinary hearing commenced this morning."However, Gus Poyet elected not to attend for disputed legal reasons. The club's disciplinary panel chose to adjourn the meeting to later this week to provide Mr Poyet with a final opportunity to attend.
"The club's separate internal process involving Charlie Oatway continues."