Winger Mitchell Pinnock has extended his contract for a further year.
The 22-year-old joined Dover following his release from Maidstone United in November 2015.
He made his debut for boss Chris Kinnear’s side as a second half sub in the 4-0 National League win against Gateshead at Crabble in February 2016.
Pinnock made 23 National League appearances last season and also came on as substitute in the FA Cup second round defeat against League 2 Cambridge United at Crabble.