Wasps have signed Brendan Macken, Tom Bristow, Jamie Stevenson and James Downey for next season.
Head coach Matt O'Connor is to leave Leinster after two seasons in charge.
Edinburgh's hopes of playing in the European Champions Cup next season have been wrecked after losing 36-23 to Leinster.
Leinster qualified for next season's European Champions Cup with a 10-0 victory over Benetton Treviso at the RDS Arena.
Stuart Barnes says that players should not be banned for accidental acts after Iain Henderson was red-carded for Ulster.
Leinster stalwart Gordon D’Arcy will make what is likely to be his final appearance at the RDS in the Friday's game with Treviso.
Fiji international back Isa Nacewa will return to Leinster for next season, the Irish club have announced.
Ireland and Leinster hooker Sean Cronin is expected to be sidelined for three months because of a shoulder injury.
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