Ulster captain Rory Best returns for Sunday's crucial European Cup clash at Gloucester after making a dramatic recovery from an ankle injury.
The hooker, named in the Ireland squad for the RBS 6 Nations, is one of eight changes made by caretaker coach Steve Williams despite Best not being expected to return to action for another couple of weeks, after injuring his ankle in the Boxing Day clash against Leinster in Dublin.
Gloucester welcome back wing Lesley Vainikolo in a game they need just to draw to progress.
The former rugby league star has recently been named in England's RBS 6 Nations squad but has not played since 29 December, after the death of his father.
England Under-20s head coach Martin Haag was full of praise for his World Rugby Under-20 Championship-winning side after Harry Mallinder inspired them to a 45-21 win over their Irish counterparts and a third title in four years.