Guinan is one of three players in the Cheltenham side who began their careers at the City Ground, together with John Finnigan and Craig Armstrong.
Before the League Two play-off final against Grimsby, Guinan had told the Western Daily Press: "It would be great for the ex-Nottingham Forest lads in the side to go up and play at the City Ground.
"We spoke about getting them in a cup match earlier this season and obviously we all have a lot of old friends there."