The Werribee forward, who was best afield with six goals in their grand-final loss to Gold Coast this season, stood out among Tuesday night's round-two national draft picks.
Every player called out before Mannagh in the draft was born in 2005 - he is a 1997 product.
The former Richmond VFL player was tipped to be taken in this draft after sustained strong form, with his grand-final performance showcasing Mannagh's attributes as a small forward.
The round-two picks also featured Dandenong defender Billy Wilson as a draft bolter and Sandringham backman Ollie Murphy as a notable slider among the selections.
Carlton used pick 34 to recruit Wilson when he was not expected to be picked up until much later.
Murphy was touted as a potential round-one selection, but he had to wait until 41, late in the second round, for Fremantle to pick him.
While there was some trading of picks, it was nowhere near the level of Monday night, which featured 29 selections for round one.
After picking Harley Reid with the No.1 pick, West Coast also had the first selection in round two at No.30 and went for key forward Archer Reid, the younger brother of Essendon key position player Zach.
Brisbane had their first pick of the draft at 30 and snapped up forward Logan Morris - like Reid, widely tipped to be taken early in Thursday's selections.
Tew Jiath, the younger brother of Hawthorn defender Chankuoth, was picked up by Collingwood at 37.
The younger Jiath revealed he is a Collingwood fan - not the Hawks - and the halfback said Magpies star Scott Pendlebury is his favourite player.
Luamon Lual, another player whose family came to Australia from South Sudan, was snapped up by Essendon at No.39.
That was significant because if he had been in the pool for one more pick, the Western Bulldogs could have bidded for him as one of their next generation academy players.
Jiath (Hawthorn) and Mitch Edwards (Fremantle), who went to Geelong with pick 32, were other NGA players snapped up by rival clubs before the No.40 threshold.
Big-kicking Tasmanian Arie Schoenmaker, who served a 10-week ban with the Tasmanian Devils earlier this year after he bought alcohol for teammates, had to wait until pick 62 for St Kilda to recruit him.
Geelong are renowned for looking to their backyard for talent and they did it again with pick 61, recruiting Barwon Heads player Oliver Wiltshire.
Brisbane, Fremantle, Port Adelaide and Richmond had their first picks in Tuesday's later rounds.
The week's drafting ends on Wednesday afternoon with the pre-season and rookie selections.
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