A scan confirmed a lengthy absence for the 25-year-old, who has won 22 caps for the Springboks and is expected to be back before the three-test series at home against France in June.
De Allende had shown good touches as the Stormers beat the Bulls 37-24 at Newlands on Saturday before going off with injury.
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(Reporting by Mark Gleeson; Editing by Amlan Chakraborty)
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