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New coach Matthew Elliott told the players last week that Mannering would stay in the role he was given as a 23-year-old in late 2009.
Elliott says Mannering is the logical choice.
"He's mutually respected and admired by all the players and staff for the quality he brings to our club as a leader and a player. He's a person of strong character and a wonderful work ethic."
Elliott said he'd waited until this month to confirm Mannering in the job as he needed to go through the right process and there was no need to rush the decision.
Mannering, who has played 165 games for the club and captained the team 65 times, said it was an honour to keep the captain's job.
The Warriors begin their pre-season schedule against Gold Coast in Queensland on February 9.
The team will be missing Feleti Mateo and Dane Nielsen, who will be playing in the NRL All Stars-Indigenous All Stars match on the same day in Brisbane.