Green began his career with Brockenhurst and Christchurch, working under Graham Kemp, before moving to Conference South club Eastleigh for a trial in summer 2009.
[4] He played 46 games in 2009–10, scoring once against Bishop's Cleeve and winning two man of the match awards, as Totton finished second in the Southern League Division One South & West.
[9] Green had trials with Reading, Millwall,[10] and Wycombe Wanderers,[11] before he was signed as a 22-year-old by Micky Adams' League Two side Port Vale in July 2011.
[16] He made his Eastleigh debut on 22 October 2011, scoring in a 3–0 win over Welling United and picking up the man of the match award.
[17] As his loan spell was coming to an end, it was revealed that Green had asked to have his Port Vale contract terminated so that he could move closer to his family.
He scored three goals in 34 league games in the 2014–15 season to help the "Spitfires" to secure a place in the Conference Premier play-offs.
[21] He made 45 appearances across the 2016–17 campaign as Eastleigh posted a 15th-place finish, but surgery on an ankle injury meant that he featured only 18 times during the 2017–18 season as the club moved up to 14th-place under the stewardship of Andy Hessenthaler.
[29] The Dorset Echo reported that the club had "pulled off one of the biggest signings in their recent history with the capture of full-back Mike Green".