The 20-year-old, a product of National League side Eastleigh`s youth set-up, signed professional terms in November 2015 on the back of an impressive stint with Evo-Stik League South West outfit AFC Totton, where he scored 6 goals in three matches.
Lee, who has also had temporary stints at Dorchester Town and Cirencester Town, had a loan spell with the Dolphins later in 2015/16 and spent part of last season under Alex Pike at relegation-bound Gosport Borough.
Lee scored regularly for Boro, despite being in a doomed squad.
He is already a firm favourite at the Black Gold Stadium and is a welcome addition to Tommy Killick's squad.