Brazilian striker Roberto Firmino has been at the heart of Liverpool's metamorphosis over the last few years.Firmino's arrival at Liverpool in 2015 coincided with that of manager Jurgen Klopp. The pair have been heavily involved in the side's evolution over the years. The Reds were languishing mid-table prior to signing Klopp, who has now turned them into one of Europe's best teams.Kloppholic@KloppholicJuninho: “Firmino is a new generation of number 9. Children in Brazil will look up to his style and his effort and believe that they too can be successful in the Premier League.” twitter.com/AnfieldArchive…11:05 AM · Sep 15, 201996841110Juninho: “Firmino is a new generation of number 9. Children in Brazil will look up to his style and his effort and believe that they too can be successful in the Premier League.” twitter.com/AnfieldArchive…Firmino is widely considered to be the nucleus in Liverpool's setup. He is highly appreciated by Klopp and is regarded as one of the manager's most trusted players.He has scored 96 goals and made 73 assists in 317 appearances in all competitions for the Reds.LiveScore@livescore club games 🏟️ Brazil caps goals assists x1 Premier League 🏴󠁧󠁢󠁥󠁮󠁧󠁿x1 Champions League x1 UEFA Super Cup x1 Club World Cup x1 Copa America Happy Birthday to Roberto Firmino 🤙#Firmino #Liverpool #LiverpoolFC11:30 AM · Oct 2, 20201824⃣3⃣9⃣ club games 🏟️4⃣4⃣ Brazil caps 🇧🇷1⃣4⃣8⃣ goals ⚽️1⃣0⃣3⃣ assists 🅰️x1 Premier League 🏆🏴󠁧󠁢󠁥󠁮󠁧󠁿x1 Champions League 🏆🇪🇺x1 UEFA Super Cup 🏆🇪🇺x1 Club World Cup 🏆🌍x1 Copa America 🏆🇧🇷Happy Birthday to Roberto Firmino 🔴🤙#Firmino #Liverpool #LiverpoolFC https://t.co/CViNTgE9c1The Brazilian's contract is set to expire next year and a new contract is yet to be discussed. As per Mirror, there have been rumours of the striker potentially leaving the club this summer or next.On that note, let's take a look at the five players that can replace Roberto Firmino at Liverpool.#5. Darwin Nunez | BenficaSL Benfica v AFC Ajax: Round Of Sixteen Leg One - UEFA Champions LeagueDarwin Nunez is highly appreciated by Liverpool, as per Si.com.The Uruguayan striker made his name with Almeria in the Spanish Segunda Division before signing for Benfica in 2020. He has an excellent goalscoring record at club level and according to Sun, he ibeing monitored by several top clubs. He has scored 40 goals and made 14 assists in just 77 appearances for Benfica.GOAL@goalDarwin Nunez's 26th goal of the season fired Benfica to the Champions League quarter-finals 🤩3:11 AM · Mar 16, 202214324611Darwin Nunez's 26th goal of the season fired Benfica to the Champions League quarter-finals 🤩 https://t.co/YNlK3QgLIrKnown for his blistering pace, Nunez usually lines up as a striker but is also capable of playing on the left wing. He displays excellent positional ability and is has already made eight senior appearances for the Uruguayan national team.#ChampionsLeague@alimo_philipBenfica’s Darwin Núñez has scored more goals in top-flight European competition including some big Champions League moments than any other player under the age of 23 this season; Barcelona Bayern Ajax🦅#EPluribusUnum#WeAreBenfica|#AJASLB|#UCL5:50 AM · Mar 16, 20221800195Benfica’s Darwin Núñez has scored more goals in top-flight European competition including some big Champions League moments than any other player under the age of 23 this season;⚽️⚽️🆚 Barcelona⚽️ 🆚 Bayern⚽️ 🆚 Ajax🦅#EPluribusUnum🔴⚪#WeAreBenfica|#AJASLB|#UCL https://t.co/BVGjjy2SNGNunez is reportedly one of Liverpool's transfer targets, with a bid seemingly imminent. He would certainly add youth and explosiveness to the Liverpool frontline.#4. Amine Gouiri | NiceBayer 04 Leverkusen v OGC Nice: Group C - UEFA Europa LeagueAmine Gouiri is another viable option for Liverpool to consider.Gouiri plys his trade with OGC Nice in Ligue 1 and has earned a respectable reputation within just three years. He has previously represented Olympique Lyon in Ligue 1 and signed for Nice in 2020.Rayane Moussallem@RioMoussallemAmine Gouiri wow what the hell!4:13 AM · Mar 2, 2022150101629Amine Gouiri wow😱 what the hell! https://t.co/3mvoX3dVGMGouiri quickly became the subject of widespread attention after his campaign with Nice last season. He scored 12 goals and provided seven assists in 34 league appearances last season. The French striker has scored 10 goals and made seven assists in 28 league games already this season.Squawka Football@SquawkaOnly three players aged 23 or under have scored 10+ goals and provided 5+ assists in Europe’s top five leagues this season: ◎ Erling Haaland ◎ Kylian Mbappé ◉ Amine Gouiri Not bad company to be keeping. 7:20 AM · Jan 23, 202257492Only three players aged 23 or under have scored 10+ goals and provided 5+ assists in Europe’s top five leagues this season: ◎ Erling Haaland ◎ Kylian Mbappé ◉ Amine Gouiri 🆕Not bad company to be keeping. 😀 https://t.co/Ec3xnnnABUSquawka Football@SquawkaDid 𝘁𝗵𝗮𝘁 Amine Gouiri assist remind you of anyone...(@tiktok_uk)8:31 AM · Mar 4, 202212112Did 𝘁𝗵𝗮𝘁 Amine Gouiri assist remind you of anyone...(@tiktok_uk) https://t.co/tzfWg7oY5YGouiri has now found himself on the watchlists of top clubs such as Liverpool and Manchester City, according to Liverpool.com. Still only 22, the Frenchman commands a market value of £40 million (as per Transfermarkt). He would doubtless be a fantastic addition to the already stacked Liverpool side.