Luis Suarez has been a fixture in the Barcelona starting XI for the past six years after joining from Liverpool.
Especially notable has been his relationship on and off the pitch with club talisman Lionel Messi, along with whom he forms a potent attacking partnership.
However, like with everyone, Father Time is beginning to catch up with Luis Suarez. There were rumours last season that the Uruguayan was probably past his best and despite a strong showing so far this season, that narrative still lingers.
Suarez is, after all, 33 and even club technical director Eric Abidal has remarked that he's sat the striker down and had a chat with him regarding his future.
Barcelona plan to bring in his replacement in the next transfer window but that's easier planned than done.
Suarez has scored 191 goals and assisted 107 times in 270 games for Barcelona. That averages exactly 1.1 goal involvements per game.
Those boots will be hard to fill.
Luckily for Barcelona, there are other options out there that they can bring in and realistically hope, will be better signings than Ousmane Dembele or Philippe Coutinho.
Here are 5 of them for discussion's sake.
5. Lautaro Martinez
Lautaro Martinez's name has been linked with a move to Barcelona from last season and the Argentinian has done those chances no harm with a stellar goal return so far in 2019/20.
He has scored 15 goals in 25 appearances for Inter and most importantly, has shown an ability to form a productive strike partnership with Romelu Lukaku - a trait that will come in handy with the likes of Messi and Griezmann realistically assured starting berths at Barcelona.
The fact that he's Argentinian also makes this transfer quite likely as he will probably get Lionel Messi's vote ahead of the other names on this list.
It also means that the duo are familiar with each other having played together for the national team.
4. Pierre Emerick Aubameyang
Aubameyang is one of the best in his position in the world and the fact that he finished as the top scorer in the Premier League last season stands testament to that.
More impressive is the fact that he isn't surrounded by world class quality and still gets it done for the Gunners .
The Gabonese marksman has 16 goals in 26 appearances this season but hasn't signed a contract extension at Arsenal with his current deal set to expire in June of 2021.
That may mean that Barcelona could get him on the cheap in the next winter transfer window but it's something Quique Setien and co. have to really think through.
Aubameyang will turn 31 this year and as such, isn't much younger than Luis Suarez.
Valencia's Rodrigo is another player touted to be Luis Suarez's long term replacement and on paper, he does have a shout.
The Brazilian born striker is already familiar with La Liga having plied his trade there for years and possesses the quickness of foot and mind to fit into a setup like Setien's Barcelona.
The drawback, however, is that the player is not a prolific scorer like Aubameyang or Laurato Martinez and has only managed 4 goals in 22 appearances this season.
He has, however, unselfishly contributed 10 assists which probably means that he would be a good fit in dressing room with big egos.
2. Timo Werner
Timo Werner is probably one of the hottest strikers in world football today with an incredible scoring record in 2019/20.
In fact, his scoring record in 2019/20 is better than that of Lionel Messi even.
The great man has 17 goals and 9 assists in 21 appearances while the rapid German has 25 goals and 10 assists in 26 appearances.
Talk about making a case for one of the biggest clubs in the world to come knocking eh. Unfortunately for Barcelona though, that also means that the likes of Liverpool and Chelsea are interested in the striker and it will be interesting to see if they pursue him in the face of a bidding war.
1. Kylian Mbappe
While Neymar divides his time between wanting out from PSG, partying in Brazil and getting treatment on the physio table, Kylian Mbappe is slowly but surely starting to follow in the footsteps of Messi and Ronaldo.
The French sensation has been linked with a high profile move to Real Madrid but if Barcelona were to decide that they want to go all in for him, they are quite capable of outbidding Florentino Perez and co.
Even at the young age of Mbappe has displayed a remarkable ability to be consistent in the face of pressure - which is a hallmark of both Messi and Ronaldo's careers .
Barcelona fan or otherwise, the prospect of Mbappe's explosive pace and finishing with Messi pulling the strings behind him is a mouth watering one.
He would not only replace Luis Suarez. He could even be an upgrade on him.
If Luis Suarez was to be replaced at the end of the season, who should Barcelona purchase?