Guernsey FC will host two sides from the Conference South in pre-season.
The Green Lions will host Havant & Waterlooville on Saturday, 19 July and Gosport Borough on Friday 1, August.
Guernsey had already earlier this month.
Tony Vance's side have also added two matches against lower-ranked sides on the same day, playing Wokingham and Emmbrook & Spelthorne Sports on Saturday, 26 July at Footes Lane.
Havant & Waterlooville, who once gave Liverpool a scare in the FA Cup, finished sixth in the Conference South last season, while Gosport as they finished 12th in Conference South.
Hellenic League East runners-up Wokingham & Emmbrook will face Guernsey at 13:00 BST on Saturday, 26 July before facing Spelthorne Sports at 16:30 BST.
Spelthorne were the when they defeated them in October 2011, as the Green Lions went on to win the that season.