19 Jun, 06:50
A single point separated the sides as a hard-fought 5th-8th place play-off finished in France's favour at Stade Henri Desgrange on Tuesday night. Check out some photos from Ireland's fourth IRB Junior World Championsip match.
He sustained the injury to his left knee and following a scan yesterday evening, it was confirmed that he has suffered a ruptured anterior cruciate ligament.
With the Ireland international adding to the province's growing injury list, he will require surgery and a significant period of rehabilitation.
Wallace was ever-present during Ulster's successful run through the Heineken Cup pool stages, and will be a notable absentee when they tackle Saracens in their quarter-final clash at Twickenham on Saturday, April 6.
Luke Marshall replaced Wallace during three of Ulster's Pool 4 matches this season. The new Ireland cap is expected to deputise for the injured 33-year-old in the province's number 12 shirt.