A midfielder who developed through Wolves’ academy, Kellermann went on to join Aldershot Town in 2016 for his first taste of National League football. He was with the Shots for two seasons, making the play-offs on both occasions, before short spells with St Mirren in the Scottish Premiership, AFC Fylde and Kidderminster Harriers.

A move to Chesterfield saw him once again make it to the play-offs before he returned south to sign for Woking in 2022. He spent the last two seasons with the Cards, achieving a first-ever play-off qualification in his first season and winning players’ player of the year.

He signed for the Fleet in the summer of 2024.