Mr McNally said the Crown appointment of Murray Strong would not affect student studies or the programmes offered next year.
Staff would continue work as usual, he said.
Mr Strong's appointment would not directly impact on the roles and responsibilities of the temporary chief executive, Mr McNally said.
The polytechnic council was disappointed but understood that intervention was necessary.
"This appointment is an opportunity for the polytechnic to address a number of the concerns and issues that the council and management team have identified and sought to resolve over recent years," Mr McNally said.
He accepted work had to be done to boost enrolments in key programmes, improve financial performance, strengthen education quality systems and offer targeted training options.
Mr McNally said there had been no discussions with the Government on the polytechnic's place in the future of West Coast tertiary education.
However, tertiary education commentators said earlier this year that the Tai Poutini Polytechnic problems meant it was vulnerable to a potential amalgamation, such as that forced on Timaru-based former Aoraki Polytechnic, which was merged with the Christchurch-based CPIT.
- Greymouth Star