The 31 year old Manu has called time on his international career after leading the Kingdom in their first ever test match against world champions Australia earlier this month.
Manu captained Tonga during their run to the World Cup semi finals last year and also won the 2008 tournament with New Zealand.
Kristian Woolf admitted he was initially surprised by Manu's decision to end his test career and said he was still one of their best and most influential players.
"In hindsight I can certainly understand where he's coming from," he said.
