Lynn was today ruled out of the series after aggravating his existing neck injury during training last week.
Dunk was the highest run scorer for BBL|06, amassing a total of 364 runs in just 222 balls faced and currently sits on an average of 52 after joining the Strikers from the Hobart Hurricanes on a deadline day trade.
Dunk has prior merit with the Australian T20 squad, earning a call up to the side in 2014 after smashing an unbeaten 229 in the Matador Cup.
Speaking on the selection of Ben Dunk, Interim National Selector Trevor Hohns said:
“It’s unfortunate that Chris is not fit to participate in this series, but we are excited at the prospects Ben will bring to the squad.
"He has had consistent performances in the BBL, IPL and CPL and also brings international experience to the squad,” concluded Hohns.
The KFC T20 International squad will assemble in Melbourne on 14 February, with the third match in the series to be played at Adelaide Oval in a Commonwealth Bank Southern Stars double-header.
Tickets are still available to all matches. Fans can visit www.cricket.com.au/tickets to find out more.