The 2023 season is Negeri Sembilan's 100th year in their history and 11th season in Malaysia Super League since it was first introduced in 2004. Also it was the 2nd season in the Malaysia Super League since promoted from Malaysia Premier League in 2021. Along with the league, the club also compete in the Malaysia Cup and Malaysia FA Cup in 2023.
On 7 January 2023, NSFC announced a new sponsor for 2023. The new sponsor is the clothing brand company Kelme. It has been informed that Kelme will sponsor NSFC for 2 years with a sponsorship value of RM1.7 million. Kelme will provide kits for the Super League, Under-23 League, President cup and Youth Cup teams starting this year.
On 8 January, the club officially announced several new signing players. Among them were Shahrel Fikri, Tauffiq Ar Rasyid Johar, Tommy Mawat Bada, Farid Nezal, Mahalli Jasuli, Sikh Izhan Nazrel, Firdaus Irman, Hafiz Ramdan, and Filemon Anyie. The club also signed brothers from Petaling Jaya City FC, Barathkumar Ramaloo and Aroon Kumar. In addition, the club retained one import player, Hérold Goulon, and added four new import players to the squad: Casagrande, Vinicius Leonel, Safuwan Baharudin, and Levy Madinda.
On March 6, 2023, Negeri Sembilan lost to JDT 7-0 at home. This defeat was witnessed by tens of thousands of NSFC fans, and it was the worst defeat of the 2023 season. The last time the team lost badly to JDT was in the 2022 season with a 5-0 defeat at Sultan Ibrahim Stadium.
On May 27, the club lost to Selangor in the FA Cup quarterfinals for 2023. The 3-1 defeat ended the club's journey in the FA Cup. The match took place at Tuanku Abdul Rahman Stadium in Paroi.
<small> Remarks:<br /> <span style="color:red"><sup>I</sup></span> International player. <span style="color:orange"><sup>A</sup></span> Asian player. <span style="color:lime"><sup>S</sup></span> ASEAN player. <span style="color:green"><sup>U23</sup></span> Under-23 player. <span style="color:cyan"><sup>U20</sup></span> Under-20 player. <span style="color:navy"><sup>U18</sup></span> Under-18 player. </small>
Source:
Match schedule source:
Key: (1) = Super League; (3) = M3 League
|- ! colspan="16" style="background:#dcdcdc; text-align:center"| Players transferred out during the season |-
Currently plays in the MFL Cup tournament for 2023. This reserve league dedicated to players under the age of 23. The MFL has also allowed a quota of 5 over-age players, including 3 foreign players in each team with only 2 players allowed to play for each match.
<small> Remarks:<br /> <span style="color:red"><sup>I</sup></span> International player. <span style="color:orange"><sup>A</sup></span> Asian player. <span style="color:lime"><sup>S</sup></span> ASEAN player. <span style="color:green"><sup>U23</sup></span> Under-23 player. <span style="color:cyan"><sup>U20</sup></span> Under-20 player. <span style="color:navy"><sup>U18</sup></span> Under-18 player. </small>
Currently plays in the President Cup tournament for 2023.