Manly has placed its trust in Kieran Foran by naming him head coach until the conclusion of the 2029 season.
Foran previously stepped in as caretaker coach after the dismissal of Anthony Seibold in March.
Under Foran's guidance, the Sea Eagles have secured seven victories out of nine games, currently ranking fifth on the ladder.
"We've been impressed with everything Kieran has done since taking on the interim role and are delighted to appoint him for the next three years," said Sea Eagles chair Scott Penn in a club statement.
"The belief and passion he has instilled in the playing group has more than delivered on the expectations.
"Kieran's deep connection to the club, extensive playing experience, and leadership qualities make him an outstanding choice to guide the Sea Eagles into the next chapter."
Foran was part of the Sea Eagles' premiership-winning team in 2011.
Across two stints, he has played nearly 200 NRL games for the club.
The New Zealand international debuted with the Sea Eagles in 2009, having also played for Parramatta, Warriors, Canterbury, and Gold Coast.