Abedi is one of Britain’s most notorious inmates following his conviction for orchestrating the 2017 suicide bomb attack on Manchester Arena by his older brother Salman.
Hassan, an Iraq asylum seeker, was jailed for the September 2017 detonation of a homemade bomb on a District Line train at Parson Green.
All three were due at Westminster magistrates court this morning to face the assault occasioning actual bodily harm charge for the first time, while Abedi and Hassan are also accused of assaulting a second prison guard, Nick Barnett.
However only Saeed appeared for this morning’s hearing.
Saeed, from the Old Trafford area of Manchester, pleaded not guilty this morning as Deputy Chief Magistrate Tan Ikram sent the case to Woolwich crown court for trial.
Abedi and Hassan have been told to attend court via videolink from HMP Frankland in County Durham for a hearing at midday tomorrow.
Neither entered any pleas today. They are both serving life sentences for the terrorist atrocities they were involved in.