Club captain Kevin Lokko made the move to Crabble from Stevenage a permanent one after signing a two-year deal for an undisclosed fee in June 2018.
The former Norwich, Colchester and Welling man played in 41 National League games for Maidstone United before joining Stevenage for an undisclosed fee in August 2017.
The defender then joined Dagenham and Redbridge on loan, making 25 National League appearances, including one against Whites in November, before being recalled by his parent club in February.
Lokko, an England C international, who can operate both at centre-back and left-back, made 12 appearances for Dover from February to April while on loan at Crabble from the League Two club during the 2017/18 campaign.
The centre-back scored one goal in that time with us, in the 2-0 win at Chester in March and continued his goalscoring form for Athletic the following season, netting six times in 39 league games.
The 23-year-old also picked up two awards last campaign, winning the National League Player of the Month for January and the Players Player of the season.