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Both players have joined the Dublin based side from Ulster to act as cover for their squad for the knockout phase of the Heineken Cup.
Ireland A utility back Wallace, who can play outside-half or full-back, missed Ulster's European campaign this season after breaking his leg in a Celtic League game against Swansea.
Front row man Bryan Young has also joined the Leinster squad. The Ireland under 21 cap was unable to join the Ulster squad for their Heineken Cup pool campaign because of injury.
Competition rules state that two additional players may be added to the original squads for the knock-out stages of the tournament.
