Winger Sean Scannell joined Town on a three year deal from Crystal Palace in June 2012, becoming Town's first signing following promotion to the Championship.
The Republic of Ireland under-21 international moved to the Terriers for an undisclosed fee.
The wide player, who can also play up front, made 141 appearances and scored 13 goals for the Eagles after graduating from their youth set-up in 2007.
Scannell qualifies to play for Ireland thanks to his father, who is from County Armagh. The 5'9" winger has played at every level for the Republic of Ireland from the under-17 setup to the B team. In 2007 he was awarded the Young Player of the Year award by the Football Association of Ireland.
Sean was a key figure for Dougie Freedman's Championship team in 2011/12, making 41 appearances and scoring four goals. During his time with the Eagles he won the 'Young Player of the Year' award in 2008 and the 'Championship Apprentice of the Year' accolade the following season.
'Scanz' became a popular figure among Town fans during his debut season as a Terrier, thanks largely to his direct style of play and two breath-taking individual goals at Leicester and Wolves.
2014/15 was a standout year for Sean, who was named 'Players' Player of the Year' at the season's end. During the campaign, he signed a contract extension running until 2017.
Sean is sponsored by S12 Property Group.