The 22-year-old is capable of playing on the left wing, up front or in an attacking central midfield role.
He joins from Bedworth Travellers FC, who compete in the Nuneaton & District Sunday Football League.
Barwell manager Jimmy Ginnelly has been watching Cassidy for quite some time and is pleased that the two parties have agreed a deal.
This announcement follows the news that several members of management and playing staff have committed to the club for next season. They are:
Stay tuned for news of another signing at 7pm this evening...
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