Ryan's return central to 'Tarf title tilt
Blackrock College v Lansdowne, Stradbrook
The confidence that 'Rock received from beating relegation rivals Belvedere was taken right out of them by a lashing at Cork Con. Coach Eric Miller needs a definitive response.
Clontarf v Cork Constitution, Castle Avenue
Centre Evan Ryan is back from injury and in contention to start against his old club as 'Tarf aim to consolidate their slender lead at the top of the table.
St Mary's College v Shannon, Templeville Road
Coach Peter Smyth will stress the importance of getting right back to the business of winning.
Dolphin v Old Belvedere, Musgrave Park
Aidan Wynne is likely to continue at 10.
UCD v Ballymena, Belfield Bowl
Centre David Lynch (hamstring) has been sidelined as has scrum-half Rob Shanley (knee), who will be replaced by Peter du Toit at scrum-half.
Bective Rangers v Terenure Coll., Donnybrook
Rangers hooker Rafa Sajur will make his comeback from injury against his old club in a tussle between two clubs which have both won their last three. Director of rugby Ian Morgan will have tight-head Gary Hamilton back in the mix to start.
DLSP v Seapoint, Kirwan Park
Coach Dave Murphy has a full squad to select from with teenager Jasper Pickersgill, out of St Columba's College, a revelation on the openside.
Greystones v Corinthians, Dr Hickey Park
Coach Reggie Corrigan doesn't have to be convinced that everything starts in the front row. Loose-head Ronan Kearney returns to Greystones from injury.
Queen's University v Dublin University, Dub Lane
Leaders Trinity are at full strength with Peter McFeely, Tim O'Mahony and Iain Hirst in the front row.
Malone v Old Wesley, Gibson Park
Coach Morgan Lennon brings in hooker Jamie Boyle and flanker Conor Boyd as his two changes.
Naas v Wanderers, Forenoughts
Player-coach Niall Carson keeps the same side.
Navan v NUIM Barnhall, Balreask Old
Centre David Sheridan broke his ankle last Saturday. John Davis could move into that slot.
Boyne v Sunday's Well, Drogheda
Player-coach Craig McGrath should be able to coax a fifth win out of his players at home to Well.
Nenagh Ormond v Suttonians, New Ormond Pk
Suttonians move Adam Griggs from scrum to out-half.