Son of former
Arsenal player
Brian Marwood,
St Mirren On 26 June 2014, Marwood signed a one-year contract with
St Mirren, with the option of a further year. He made his competitive debut for the club against
Motherwell on 9 August 2014, in the Scottish Premiership. On 20 January 2015, he left St Mirren, with his contract being cancelled by mutual consent.
Forest Green Rovers On 23 January 2015, it was announced that Marwood had signed for
Conference Premier side
Forest Green Rovers on an 18-month contract. He made his debut for the club on 31 January 2015 as a substitute in a 1–0 home win over
Nuneaton Town. He scored his first goal for the club on 10 February 2015 in a 2–2 away draw against
Alfreton Town. At the end of the
2014–15 season he helped Forest Green to the play-offs, only to be denied a second consecutive year of appearing in the final because of a semi-final defeat against
Bristol Rovers.
Gateshead On 24 June 2015, it was announced that Marwood had left Forest Green and re-signed for Gateshead. After missing the majority of the season with a career ending injury, Marwood retired that season. ==International career==