Brough has spent pre-season on trial at York Street, but his immediate future lies away from professional football and he will continue playing for Barrow AFC in the Unibond League.
Brough has future at Boston
Boston boss Neil Thompson said: "He's someone we'll keep an eye on. We've got no room for him at the moment, but things change.
"Players can get sold or leave the club and others come in. This was a chance to look at Scott close up and he was happy with that."