Meanwhile, youngster Anthony-Gomez Mancini has had a clause in his loan deal triggered that will keep at Turf Moor until 2022.
Solid at the back
Pieters, Lowton and Long were the three defenders of the four who signed new deals and have all three of them have had parts to play in the recent good run of form.
Long's last appearance for the Clarets was the 3-0 FA Cup victory over Fulham in which the Irishman scored.
The 30-year-old is the clubs, longest-serving player, having spent over 10 years at the club and has signed a deal that will keep him at the club until 2023.
Despite being at the club for that amount of time, Long is yet to make 100 appearances for the Clarets and he will hope his new deal will allow him to achieve that milestone.
Lowton joined Sean Dyche at Burnley in July 2015 and has been a key figure in the backline ever since and has also tied himself to a two-year-deal that will end in 2023.
The former Aston Villa full-back has made 154 appearances for Burnley and that could have been more if it wasn't for an injury.
Many would argue the clubs best backline consists of Lowton, alongside Ben Mee, James Tarkowski, Charlie Taylor and Nick Pope and therefore his commitment to stay at Turf Moor is crucial for the club.
The final defender to tie himself down with the club was Pieters, who has been an important player for the Clarets wherever he has played. Pieters' contract is a year shorter and will see him stay at the club until the end of the 21/22 season.
Whether it's been covering for Taylor at left-back or for Dwight McNeil as on the left side of a midfield four, Pieters has been more than reliable for Dyche and has won ever many fans.
Out of three defenders, Pieters has been at the club for the shortest amount of time but the Dutchman is on course to reach 50 appearances by the end of the season, being only seven away.
Magician in Midfield
The final of the four is Gudmundsson, who may have not lived up to many fans expectations due to injury issues. On his day the Icelandic international is a star in claret and blue, his pace and creativity can offer a direct side like Burnley something different.
Despite consistent injury issues, the right midfielder has still played 122 appearances for the Clarets and will look to make that number as big as possible before his contract expires in 2023.