Striker Gary Hooper is one of five foreign players on the Phoenix roster.

Wellington Phoenix are investigating how New Zealand's imminent border closure will impact the club's import players amid fears they could be barred from re-entering the country.

The Government announced on Thursday that it will be closing the border to everyone but citizens and permanent residents from 11:59pm in attempt to stop the growth of Covid-19.

"Protecting New Zealanders from Covid-19 is our number one priority. In recent days it has become increasingly clear that the spread of the virus in other parts of the world means we need to take even stronger border measures," Prime Minister Jacinda Ardern said.

"Today's decision stops any tourist, or temporary visa holder such as students or temporary workers, from coming to and entering into New Zealand."

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Although Australian citizens and residents who normally live in New Zealand can still enter the country, the border closure could have serious consequences for the Phoenix's five import players; David Ball, Gary Hooper, Ulises Davila, Matti Steinmann and captain Steven Taylor.

A Phoenix spokesperson said while the club had prepared for the possibility a border closure, they were "currently investigating the situation and its impact on our players and staff".

The Phoenix flew to Sydney on Wednesday in order to see out the remainder of the A-League season in Australia, with some wearing face masks at the airport as a precaution.

​Ball's wife and two sons have remained in Wellington.

Phoenix players and coaching staff are currently in quarantine at an undisclosed training facility in greater Sydney.

Although they have been granted permission from New South Wales health officials to train together while in isolation, they will not be able to play until the 14 day window expires.

On Thursday, the Australian Government also announced it will be closing its border to all non-residents.