Ulster Schools will have four of last season's team, Robert Lyttle, Conor Kelly, Jonny McKeown and Ben Pentland, in action when they face London Irish at Sunbury this afternoon (1pm).
Ulster have arranged two friendlies before they travel to Connacht, for the first inter-provincial, in a fortnight's time.
"'We want to see all the squad in action so have arranged another friendly at Glasgow next Friday," said manager Richard Clingan.
"This will give the players some vital match practice before the serious competition starts."
Schools Cup holders Methodist College supply four of the team, Kelly, Ben O'Reilly, Daniel Coulter and Zac Jordan and Wallace High have three in Pentland, Phil Hylands and Jonathan Stewart.
The Ulster Under-20 side had a satisfactory outing against Italy in a 12-12 draw on Monday and play the Exiles at Newforge this afternoon (4.30pm).
"Italy fielded their strongest team and we matched them physically up front," said manager Terry McMaster.
"It was our first game and maybe we lacked match fitness but a draw keeps everyone happy and lets us know where we are.
"The team will be completely different as we want to utilise all the squad against the Exiles and then at London Irish next week."
Ulster Schools: P Hylands (Wallace), R Lyttle (RBAI) C Kelly (Methody), R Butler (Campbell College), C Field (RBAI), M McDowell (Ballyclare High), J Stewart (Wallace), B O'Reilly (Methody), B Pentland (Wallace), P Matthews (Royal School, Armagh), N Rea (Ballymena Academy), R Sinton (RS, Armagh), J McKeown (Ballymena Academy), D Coulter, Z Jordan (both Methody)
Replacements: C McEvoy (Sullivan Upper), D Kealy (Campbell College), A Kilpatrick (Methody), J Houston, F Jeffrey (both Sullivan Upper), J Magee (Ballyclare High), N Kilpatrick (Wallace), J McBride (Belfast High), J Howard (Campbell College), R Hunter (Dalriada), J Haldane (Campbell College)