Amadeus will issue Wyllie 27 million shares at 55c each to raise $14.85 million. Proceeds from the placement will be used to retire.

Wyllie senior advisor Craig Coleman and non-executive director Stephen Pearce - a former Alinta and Woodside senior executive - will join the board of Amadeus as Wyllie's nominees.

In addition, Amadeus will appoint an external consultant to conduct a wide-ranging corporate review with a view to optimising shareholder value.

"We believe Craig and Stephen will bring great qualities and value to the Amadeus Board at a time when we are exploring how best to maximise value for shareholders from our exceptional portfolio of assets," Amadeus managing director Geoff Towner said.