The Rebels' boss, who has guided his team to a second successive promotion and into next Thursday's League Challenge Cup final, wants a last hurrah and is threatening to bring himself on as a sub for the last 10 minutes.
The 36-year-old van driver has not played since he suffered a knee injury turning out for Flixton two years ago.
Two months later he was appointed FC manager and, despite registering as a player last season, did not play for the club.
"It might be a bit selfish, but I want to finish my career on a high, and it's something I have been mulling over," said Marginson, a former Rotherham and Macclesfield striker.
"I am sure I will get some stick from our fans, but they will shut up when I belt one in the top corner!"
The match will also mark the retirement of assistant manager Darren Lyons and defender Dave Brown.
The club intends to turn the match into a celebration and has invited George Best's sister Barbara McNarry to be a special guest - she will accept a cheque for £3,000 raised for her brother's charity Foundation.
And Marginson wants his players to cap a fantastic league season with a win over lowly Formby - last season they had to pick up the Division Two trophy after losing to Great Harwood Town 1-0 in front of over 6,000 fans.
Marginson will be without Rob Nugent who will rest a knee injury and the suspended Stuart Rudd.
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Free Red, Manchester (27/04/2007 at 12:44)