Hollis is a graduate of the Meadow Lane youth Academy and initially agreed a professional deal in the summer of 2011.
The naturally gifted centre-back’s first season saw him impress during loan spells with the likes of Barrow and Darlington.
Hollis also made his senior bow for the Magpies where he was tasked with marking free-scoring frontman Jordan Rhodes and he did not disappoint.
After agreeing a one-year contract extension in 2012, Hollis’s aim was to break into the starting 11 on a regular basis.
He was was given the chance to prove himself towards the back end of the 2012.13 season and he was rewarded with a new long-term deal.
Hollis had to wait almost another year for his next chance but became a valuable inclusion at the back under Shaun Derry.
The centre-back, who is now the club's longest serving senior player, not only helped to sure up the County back four during the 2013.14 Great Escape run, he contributed a number of goals - mostly from set-pieces where he is never afraid to attack the ball.
The impact he made during The Great Escape was highlighted with him being awarded the number six shirt for the 2014.15 campaign.