Nathan Arnold (30) has agreed to join the Pilgrims on an initial one-year deal in a dual playing and management role.
Arnold left neighbours Lincoln City on Friday after a successful spell with the Red Imps, which included promotion from the National League and a run to the quarter-finals of the Emirates FA Cup in 2016-2017.
He also won promotion from the National League with Grimsby Town a year earlier.
Reflecting on Arnold’s arrival, Elliott said: “Persuading Nathan to join us is a real coup for the football club given the other offers he had, but his enthusiasm to join Boston United was evident.
“Nathan will play a key role on and off the pitch for us and I have offered him the opportunity to become an integral part of my management staff. We have had good discussions and I am looking forward to working closely with him.
“It is an exciting move all-round and kicks off our summer recruitment in style.”