Canterbury Wizards all-rounder Andrew Ellis has been added to New Zealand's Twenty20 squad for the two matches against Zimbabwe following an injury to Dean Brownlie.

Brownlie fractured his finger while fielding during the second one-day international against Zimbabwe in Whangarei, and a hand specialist has confirmed that he will likely be out of action for a month.

That rules the middle-order batsman out of the Twenty20 and one-day series against South Africa later this month, but also opens the door to Ellis, who made his international debut in the first ODI against Zimbabwe.

Ellis went on to play all three matches in the one-day series, but had limited opportunities due to New Zealand's dominance.

"We would like to give Andrew the opportunity to show us his hitting power as he has not had the chance to spend a lot of time at the crease in this series," said Black Caps coach John Wright.

New Zealand Twenty20 squad: Brendon McCullum (capt), Michael Bates, Doug Bracewell, Andrew Ellis, Colin de Grandhomme, James Franklin, Martin Guptill, Ronnie Hira, Nathan McCullum, Kyle Mills, Rob Nicol, Jacob Oram, Tim Southee, Kane Williamson.