The 24-year-old joined Celtic in 2017 when Brendan Rodgers was at the helm and has gone onto to make 123 appearances.
Operating as a central midfielder Ntcham has chipped in with 23 goals during his stint North of the Border and won every possible piece of silverware in Scotland with three Premiership titles, three League Cups, and two Scottish Cups.
During that time the former Manchester City youth has also accumulated 20 under-21 appearances for France.
Possible Pierre-Emile Hojbjerg Replacement?
The Dane was allowed to leave after revealing that he would not be looking to renew his contract which was due to expire next summer, and so Saints cashed in while they could.
That has, however, left a big hole in Ralph Hasenhuttl's midfield, and in need of a new replacement ahead of the new season with Ntcham looking like he could be the one.
Currently, the Frenchman still has two years left on his current deal which expires in 2022 with 90min also reporting his value to be around the £20m mark.
Race for his signature
Southampton isn't the only Premier League club interesting in signing the midfielder with both West Ham and Everton joining the race for his signature as they look to build their squads after both enduring a poor season.
Both sides will no doubt have significant leverage when it comes to wages so Soutmapton may have to act quickly to win the race for their third summer signing after completing moves for Kyle Walker-Peters and Mohammed Salisu.
Ntcham began his football career at youth levels in France with Paris FC and Le Havre before making a switch to Manchester City's academy in 2012.
Rising through the under-18 and under-23 setups in Manchester Ntcham was then loaned out to Genoa in the Serie A for both the 2015/16 and 2016/17 seasons, where he featured 41 times.
It was his impressive loan spell in Italy that lead to Celtic signing the then 21-year-old on a four-year deal in 2017.
Ntcham would be the latest star to make the switch from Celtic Park in recent years following in the footsteps of the likes of Virgil van Dijk, Stuart Armstrong, and Fraser Forster.