Horsham striker departs club
Lavery, who initially joined the Clarets on a one month loan deal in November, was in and out of the first team at the Hornets this campaign.
The striker made 15 appearances in all competitions this season, scoring once.
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Hide AdIn total, Lavery made 38 appearances throughout his Horsham career, scoring four goals.
The Hornets have also confirmed they will not call on Dorking Wanderers loanees JJ O'Sullivan and Ben Dyett.
The pair have made a combined 22 appearances on loan from Wanderers.
Horsham will also be without Charlie Harris for three games, starting on Saturday at home to Bishop's Stortford, as the midfield maestro travels to Australia.