The 18-year-old suffered a serious knee injury in August, which cut his time at the Corinium Stadium.
However, Guinan is now fit and has returned to Cirencester in search of first-team minutes.
Before his injury, he made 3 appearances during his loan spell, and now has a month loan spell with the Centurians.
The striker is a product of Cheltenham's academy and was given a professional contract in the summer after an impressive season with the under-18s.
He has also had loan spells with Bishops Cleeve and Bromsgrove Sporting and his first time at Cirencester was towards the end of the 2021/22 season when they were in Division One South.
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