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The 25-year-old only moved to the Saints from London Irish at the start of the season, and came into the club fresh from starring for the Lions in Australia last summer.
But after spending most of this campaign watching on from the sidelines, Mallinder expects his man back on the pitch for the start of May against Bath in the penultimate round of the Premiership.
"As we've said all along, we expect Corbs to be back before the end of the season," Mallinder said. "We're hopeful he'll be back for the Bath game."