The 35-year-old Vettori, who played the most-recent of his 112 tests for New Zealand two years ago, became available when his Jamaican side was eliminated from contention in the Caribbean Premier League.
New Zealand allrounder Corey Anderson is unavailable for Northern Districts, but will play at the Champions tournament for his Indian Premier League side, the Mumbai Indians.
Northern's 15-man squad has yet to be confirmed, but will include Vettori and current or former New Zealand players Scott Styris, Kane Williamson, Tim Southee, Trent Boult, BJ Watling and Daniel Flynn.

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