He wants fans up and down the country to do their bit for charity by buying the shirts - which you can see on his Twitter profile, including this blue beauty which I owned back in the day. But hurry, the auction ends this weekend!
LOVS caught up with Marshall this morning to get the lowdown on his charity venture and get his thoughts on his days wearing the white shirt of Bolton Wanderers.
On the charity shirt auction, Marshall said:
"I'm raising money for Cancer Research UK, as I lost my dad to cancer a few years ago. I'm selling six or seven shirts for the charity, and to raise money for the academy I set up so we can take the students on a trip before we start.
"How it works is people follow me on Twitter (@BigMarshy20), I will follow them back and then they can DM me with the price they want to bid for the shirt."
Marshall joined Bolton in 2000 as a 35-year-old (sounds familiar). He made 38 league appearances and scored six goals in the side that managed to secure promotion back to the Premier League under the stewardship of Sam Allardyce. He was predominantly a striker but often filled in at centre back - and was once told by former manager Joe Royle that if he played there regularly he would have played for England.
Liverpool-born Marshall made 411 career league appearances and scored 94 goals in his 18-year career. He joined Everton in 1984, making 15 appearances in a four-year stay before joining Oldham Athletic. He made 170 league appearances for The Latics, scoring 36 goals. He then moved onto Ipswich Town, scoring 32 goals in 84 league appearances, and Leicester City, where he scored 18 goals in 83 league appearances, before joining Bolton. He then finished his career with Blackpool.
Marshall now runs IMFootball, a football academy for boys and girls aged 16-18 in Ipswich, as well as his duties as a football pundit.
Marshall, a Liverpool fan who told us he is far from a fan of manager Brendan Rodgers, has fond memories of his time at Wanderers, and gave us a bit of insight into that defender / striker tag:
"I had a wonderful time at Bolton, and it was a great achievement for us to get back into the Premier League. Big Sam is one of the best managers out there - I wish Leicester had got him as manager this season!
"I loved being a striker, but I got picked as a defender as a job. There's nothing better than scoring a goal though!"
To get involved in Marshall's charity auction, just go and follow him at @bigmarshy20 and Direct Message him to put in your bids on his shirts.