Real Madrid are arguably the biggest club in football history.With a massive 13 UEFA Champions League titles to their name, it goes without saying that the Los Blancos are considered one of the most successful clubs in European football history.ESPN FC@ESPNFC 30/30 successful UCL group stagesReal Madrid are the only team in history to maintain a perfect record of advancing the group stages in the Champions League 2:00 AM · Nov 26, 20217329704✅ 30/30 successful UCL group stagesReal Madrid are the only team in history to maintain a perfect record of advancing the group stages in the Champions League 🔥 https://t.co/8PKPzrTH53Los Blancos have built a reputation for being ruthless over the years and boast an aura that is unparalleled on the football scene. The club has the ability to attract the world's best players and has always challenged for all of football's top prizes on a consistent basis.Let's take a look at the five players who could return to Real Madrid in the future.#5. Sergio Ramos | Paris Saint-GermainReal Madrid v Club Atletico de Madrid - Supercopa de Espana FinalSergio Ramos is considered to be one of Real Madrid's legends of the modern era.Ramos signed for Madrid in 2005 from Sevilla and went on to spend 16 years in the Spanish capital. He has enjoyed great success with the club and is widely regarded as one of the greatest defenders of all time.B/R Football@brfootball15 years since Sergio Ramos signed for Real Madrid.His record speaks for itself 5:40 AM · Aug 31, 202011205221915 years since Sergio Ramos signed for Real Madrid.His record speaks for itself 🏆 https://t.co/eYL3PFmaVdRamos won five La Liga titles, two Copa del Rey trophies and four Supercopa de Espana during his time with Madrid. His most memorable achievement was winning the UEFA Champions League four times in a span of just five years.bet365@bet365In 2005, Sergio Ramos signed for Real Madrid for a record fee for a Spanish defender.671 games141 G/A Champions League titles league titles Spanish cupsAnd 26 red cards.The club confirm he's left the Bernabéu.End of an Era.1:17 AM · Jun 17, 202111618In 2005, Sergio Ramos signed for Real Madrid for a record fee for a Spanish defender.671 games141 G/A🏆🏆🏆🏆 Champions League titles🏆🏆🏆🏆🏆 league titles🏆🏆 Spanish cupsAnd 26 red cards.The club confirm he's left the Bernabéu.End of an Era. https://t.co/VJtf3IEjanRamos left Real Madrid last year and went on to join Paris Saint-Germain on a free transfer. His move has not particularly worked out, as Ramos has made just five appearances for the club and his season has been plagued with injuries.#4. Cristiano Ronaldo | Manchester UnitedManchester United v Newcastle United - Premier LeagueCristiano Ronaldo is a bonafide legend of world football.The Portuguese will go down in history as one of the best to ever play the game. He has enjoyed widespread success across England, Spain and Italy and continues to perform at an extremely high level despite his age.Ronaldo created history with Real Madrid. Signed for a reported £80 million in 2019, Ronaldo went on to score a mammoth 450 goals in just 438 appearances for Los Blancos.B/R Football@brfootballOn this day in 2009, Manchester Utd accepted a world-record £80M/$113M from Real Madrid for Cristiano Ronaldo. 438 games 450 goals 4 Champions Leagues 4 Ballons d’OrLegendary era. 6:23 AM · Jun 11, 2021268563607On this day in 2009, Manchester Utd accepted a world-record £80M/$113M from Real Madrid for Cristiano Ronaldo.▪️ 438 games▪️ 450 goals▪️ 4 Champions Leagues▪️ 4 Ballons d’OrLegendary era. ⚪ https://t.co/EYzocpszOvHe won two La Liga titles and a stunning four UEFA Champions League trophies during his time with Madrid. Ronaldo left Madrid in 2018 and spent three years with Juventus before re-signing for Manchester United last year.UEFA Champions League@ChampionsLeague #OTD in 2009, Real Madrid unveiled new signing Cristiano Ronaldo. The rest is history.#UCL | @realmadriden1:43 AM · Jul 6, 2020211724128📅 #OTD in 2009, Real Madrid unveiled new signing Cristiano Ronaldo. The rest is history.⚪️2⃣0⃣1⃣4⃣🏆⚪️2⃣0⃣1⃣6⃣🏆⚪️2⃣0⃣1⃣7⃣🏆⚪️2⃣0⃣1⃣8⃣🏆#UCL | @realmadriden https://t.co/GytK9949UyWith United's hopes for Champions League football next season looking bleak, it looks increasingly likely that Ronaldo may leave the club.