The Prime Minister is making no firm commitments about MP Judith Collins getting back into Cabinet.

Speaking on TVNZ's Q+A programme today Ms Collins, who lost her portfolios during last year's dirty politics scandal, has made it clear she'd like to be a Cabinet Minister again.

John Key says she's always been ambitious, and is ambitious to get back into cabinet.

But he makes no guarantees Ms Collins will be back behind a minister's desk by the end of the year.

"I don't know, it's possible. I certainly haven't ruled out her coming back, but it would depend on an opportunity opening itself up."