Mr Kelly was stabbed to death at Grafton Street in the Rosemount area on March 4, 2018.
The three accused will appear at the Crown Court sitting in Belfast for the hearing where they will be asked how they plead to the charge of murder: guilty or not guilty.
The defendants are: Gary Anderson (22) and brother Sean Anderson (20) whose addresses are given as c/o of Hydebank Wood Young Offenders Centre in south Belfast
The third accused is Michael Dunlop from Fern Park in the city.
He can now be named as he turned 18 in February this year.
Dunlop is further accused of attempted grievous bodily harm with intent and doing an act to pervert the course of justice.
He was recently transferred from Woodlands Juvenile Justice Centre to Hydebank Young Offenders’ Centre after he turned 18.
In February , Dunlop’s lawyers mounted a fresh application for bail amid claims he is under a “live threat” from two others currently being held at the Hydebank facilities.
But Crown lawyer Conor Maguire told the court staff at the detention centre have indicated Dunlop will be “managed appropriately” to ensure no harm comes to him.
Prison bosses are also to consider possibly moving the other two inmates to an adult establishment.
“If the applicant moves to Hydebank, not only does the Governor have an obligation to care for the applicant and his safety, but assurances have been given in that regard,” Mr Maguire said.
The barrister also claimed Dunlop and his co-accused remain at risk within the Derry area.
Defence barrister Plunkett Nugent argued that threats on gable walls in the city relate to the other two murder suspects.
He insisted that Dunlop has been charged with murder on the basis of joint enterprise.
No forensic evidence or eye witness accounts link the teenager to actually carrying out the fatal attack, the court was told.
Mr Nugent added that Dunlop would seek to get back onto a college bricklaying course if released on bail.
But adjourning the application, Mr Justice McAlinden said he will review the case again following Dunlop’s transfer to Hydebank.
The judge said: “It would be very difficult for any court to release an applicant on bail to an address in any environment in the community where he is, or could be potentially, under serious threat.”