[5] Mannagh also represented the Ovens & Murray Football Netball League in the senior interleague side in 2016 too.

While remaining on Richmond's VFL list, Mannagh returned to the Ovens & Murray League, this time playing for Lavington in 2019[7] and was best on ground in their 2019 premiership with five goals,[8] winning the Did Simpson Medal.

[15] He then kicked six goals from 28 disposals in a losing Grand Final against the Gold Coast Suns in 2023, being rewarded with the Norm Goss Memorial Medal.

After a few years of attracting the attention of AFL clubs, his Grand Final performances were enough to enter the national draft as a mature-aged rookie.

[18] He made his senior debut at 26 years of age against St Kilda at GMHBA Stadium in round 1 of 2024.