De Haan will pump £100 million in the company, which was founded by his father, to boost its finances amid the coronavirus crisis, and seek a further £50 million from existing investors.
Saga confirmed de Haan’s plans in a note to the stock exchange issued on Tuesday morning (1 September).
Upon completion, de Haan would join the board as non-executive chair, taking over from Patrick O’Sullivan on a three-year term.
The proposed investment has been cleared by the Financial Conduct Authority, with other approvals "at an advanced stage".