The Wellington-based franchise finished sixth in the 10-team competition, making the playoffs for the first time since 2015. However manager Mark Rudan has left after just one season while Johnny Warren Medal winner Roy Krishna is also leaving the club in the offseason.
In 2016 the FFA and Phoenix agreed to a 10-year-deal for the extension of the club's A-League licence - with the club granted an immediate four-year extension of its licence through to the end of the 2019/20 season.
That would be followed by two further three-year extensions through to 2022/23 and then 2025/26, dependent on a number of factors, especially improved broadcast rights from New Zealand.
"I'm very confident," Morrison told the Herald on Sunday in February when asked about the possibility of the Phoenix existing into the next decade.
"But I have always been confident. We have got fantastic backing from the other clubs and I don't see any reason why anything is going to change there. We have to grow ourselves and prove we should be in there, but I'm quite confident."