Having agreed a new two-year Porto deal, Iker Casillas could become the first player to feature in 200 UEFA club games.
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186: Iker Casillas (ESP, Real Madrid, Porto)
Casillas made 157 UEFA appearances for Real Madrid before leaving for Porto in 2015, bringing to an end a 16-year, trophy-strewn spell. Having won a record 167 caps for Spain, the 37-year-old lifted his first Portuguese league title in 2017/18, and is just 14 appearances shy of an incredible 200 in UEFA club games.
174: Paolo Maldini (ITA, AC Milan)
The right-footed left-back and central defender played until he was 41, becoming as important a figure in Milan's history as his father Cesare Maldini – winner of four league titles and the 1962/63 European Champion Clubs' Cup. Paolo lifted that trophy five times, plus seven Italian championships.
173: Xavi Hernández (ESP, Barcelona)
The former Barcelona midfielder picked up more trophies – 28 – than any other player in Spanish history, also winning the UEFA Champions League four times.
171: Pepe Reina (Barcelona, Villarreal, Liverpool, Napoli, Bayern München)
The highest-ranked player not to have won a major UEFA trophy, the 36-year-old keeper featured in six UEFA Europa League games at AC Milan this season.
168: Cristiano Ronaldo (Manchester United, Real Madrid, Juventus)
The top scorer in UEFA club competition with 127 goals, Cristiano Ronaldo is maintaining that extraordinary form following his move to Turin last summer.
The next 20
165: Gianluigi Buffon (Parma, Juventus, Paris)
163: Clarence Seedorf (Ajax, Real Madrid, Internazionale Milano, AC Milan)
161: Raúl González (Real Madrid, Schalke)
160: Javier Zanetti (Internazionale Milano)
159: Ryan Giggs (Manchester United)
155: Dani Alves (Sevilla, Barcelona, Juventus, Paris)
150: Jamie Carragher (Liverpool)
146: Darijo Srna (Shakhtar Donetsk)
144: Sergei Ignashevich (Lokomotiv Moskva, CSKA Moskva)
144: Roberto Carlos (Internazionale Milano, Real Madrid, Fenerbahçe)
143: Andriy Shevchenko (Dynamo Kyiv, AC Milan, Chelsea)
143: Olexandr Shovkovskiy (Dynamo Kyiv)
143: Edwin van der Sar (Ajax, Juventus, Fulham, Manchester United)
142: Oliver Kahn (Karlsruher, Bayern München)
142: Luís Figo (Sporting, Barcelona, Real Madrid, Internazionale Milano)
140: Thierry Henry (Monaco, Juventus, Arsenal, Barcelona)
140: Zlatan Ibrahimović (Ajax, Juventus, Internazionale Milano, Barcelona, AC Milan, Paris Saint-Germain, Manchester United)
139: Andrés Iniesta (Barcelona)
139: Andrea Pirlo (Internazionale Milano, AC Milan, Juventus)
137: Paul Scholes (Manchester United)
137: Anatoliy Tymoshchuk (Shakhtar Donetsk, Zenit, Bayern München, Kairat)
*UEFA club competitions means European Champion Clubs' Cup/UEFA Champions League, UEFA Cup/UEFA Europa League, European/South American Cup, UEFA Cup Winners' Cup, UEFA Super Cup and UEFA Intertoto Cup