Lincoln City have completed the triple signing of defender Tom Miller, and midfielders Daniel Gray and Geoffrey Gouveia on one-year contracts.
Miller, 22, first joined the Imps on loan from Newport County in March, helping them move away from the Blue Square Bet Premier relegation zone.
Gray, 22, and Gouveia, 21, both join Lincoln following pre-season trials.
Chesterfield released Gray at the end of last season, while Gouveia has moved from Boston State Team in the US.
Lincoln boss David Holdsworth told BBC Lincolnshire: "Tom wanted to come back here which is the most important thing.
"He is a great prospect and is still learning. We know what quality Tom brings - I'm delighted he has joined."