The 22-year-old signed for the Saints in September 2020 from Vanarama National League South side Billericay Town.

He had joined Billericay in November 2019 after returning to England after a six-month spell in Iceland`s Úrvalsdeild with ÍBV.

He moved to Iceland after being released by MK Dons at the end of the 2018/19 season.

He made just the one first-team appearance for the Dons in May 2016 but did enjoy spells on loan in the National League South with Hemel Hempstead Town and National League North for Brackley Town.

Jackson told Portadown`s website: “My move to Portadown is something that has been on my mind for some time now, from January of 2021 actually when I spoke quite a bit to the manager and Ben Tilney, who is a old team-mate of mine, about coming over but with Covid being so unpredictable it wasn’t the right time to make the move. Since then, however, me and the manager got back in contact and came to an agreement.

“The things that attracted me to Portadown were the history the club holds in Northern Ireland and also the way manager Matthew Tipton spoke about what the club is trying to achieve and where he wants to take Portadown, I want to be a part of what’s coming next. How close the Portadown community is was also a massive thing for me in a football club.

“I cannot wait to get started and meet the team, it’s almost frustrating and I’m just keeping my head down and working on my off season programme in the meantime until the first day of pre-season”.