Arriving from League One neighbours Cheltenham Town is 18-year-old Zac Guinan.
A second year, he made his first-team debut for the Robins in a Papa John's Trophy tie against Chelsea under-21s in October 2021.
The forward had featured for the first team previously during pre-season.
He has also spent time on loan at Southern Premier Division Central side Bromsgrove Sporting and in the Uhlsport Hellenic League Premier Division with Bishop's Cleeve.
Midfielder Rio Dyer moves to the Causeway Ground from Championship side Hull City.
Dyer, also 18, joined Hull on a two-year scholarship from Swansea City in June 2020.
A regular with the under-18s, the winger made his Wales under-18 debut against England under-18s at the Leckwith International Stadium in Cardiff in March 2021.
His first outing for the Hull under-23s came a month later against Sheffield Wednesday.
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