Fans on Twitter have brought up a Cristiano Ronaldo reference as Paris Saint-Germain (PSG) superstars Lionel Messi and Neymar were involved in a heartwarming social media exchange.Messi's chapter at the Parisian club came to an end as the Argentine leaves as a free agent. Their Ligue 1 home clash against Clement Foot was his last. They lost the match 3-2.Neymar wished his former Barcelona teammate goodbye, writing on social media:"Brother... it didn't turn out as we thought but we tried everything. It was a pleasure to share 2 more years with you. Good luck in your new stage and be happy. I love you."Messi commented on the post:"Thanks Ney! Beyond everything that remains, that we once again enjoyed playing together and sharing the day to day. I wish you all the best. Apart from being a crack, you're a beautiful person and that's what it's worth in the end. I love you very much."Fans are now commenting on the exchange, with one writing:"Noticed how Ronaldo's ex-teammates didn't wish him goodbye."Here are some of the best reactions across Twitter as Neymar and Lionel Messi were involved in a heartwarming social media exchange after the 35-year-old's final PSG game:Calista90@benize1990@goal Noticed how Ronaldo ex team mates didn't wish him goodbye9@goal Noticed how Ronaldo ex team mates didn't wish him goodbyeGOAL@goalThis exchange between Neymar and Lionel Messi 🥺7084571This exchange between Neymar and Lionel Messi 🥺 https://t.co/W96GqIqRA8Naïva🌳🕊️@NaivaLiu@goal The friendship between these two genius is beyond any sport, so rare, so beautiful ! 🤩3@goal The friendship between these two genius is beyond any sport, so rare, so beautiful ! ❤️🤩عقیل@aqeeltwts@goal The only thing we'll miss @goal The only thing we'll miss ❤️✨️@BadGirlTurnGoob@goal Brothers for life 🥺@goal Brothers for life 😭❤💙🥺sasha@sashanovas@goal best bromance in football@goal best bromance in footballIbson G@Ibson143@goal That's amazing of them though am not a fan of Lionel messi2@goal That's amazing of them though am not a fan of Lionel messiTOP STRIKER@CHAMP_OFFICIAL1@goal @lordnose6 Brothers @goal @lordnose6 Brothers 🔥🔥Lionel Messi could join Cristiano Ronaldo in Saudi Arabia after PSG exitLionel Messi leaves PSG upon the expiration of his contract. He has been heavily linked with a move to Saudi Pro League club Al-Hilal as a free agent. The Middle Eastern club has reportedly offered Messi a mega £320 million per season contract.His moving to Saudi Arabia will reignite the rivalry with Cristiano Ronaldo as the Portuguese plays for Al-Hilal's city rivals Al-Nassr. Fans could see football's greatest duel reopen.Messi has also been linked with a return to Barcelona. However, nothing is concrete about his future yet. Recent reports suggest that Chelsea, Newcastle United, and Manchester City are also keeping a keen eye on the 35-year-old's situation.