Hughes and Sammon leave Hearts as Tynecastle contracts end
Demetri Mitchell and Conor Shaughnessy have also left the club after their loans expired.
Aaron Hughes and Conor Sammon have both left Hearts after their Tynecastle contracts came to an end.
Veteran defender Hughes, who holds a British record for caps after 112 appearances for Northern Ireland, joined the club on a short-term deal in 2017 but signed two further contracts as Craig Levein utilised the 39-year-old's experience.
Sammon moved to the club three years ago but was unable to secure a first team place and went out on loan to Kilmarnock, Partick Thistle and Motherwell. He scored twice in 27 games for Hearts.
Demetri Mitchell leaves Hearts to return to parent club Manchester United. The full-back made 27 appearances over two loan spells but saw this season curtailed by injury.
And Leeds United's Conor Shaughnessy, who moved to Edinburgh on loan in January, also returns south.