The pair formed a formidable midfielder partnership during Alonso’s five-year spell at Anfield, during which time Liverpool won the Champions League and the FA Cup.
However, it couldn’t last forever, with Alonso choosing to leave the Premier League in 2009 as he joined Real Madrid.
Some Liverpool fans still believe that the 35-year-old’s departure directly contributed to the club’s failure to add to their honours list in recent seasons.
Meanwhile Alonso went on to lift the World Cup with Spain, a La Liga title and another Champions League with Madrid, before closing his career with three league titles in Germany with Bayern Munich.
And the whole thing appears to have broken Gerrard’s heart, as he admitted in this emotional retirement message to Alonso:
Gerrard leaves beautiful message to Xabi Alonso upon Spaniard's retirement ❤️
'When you left, it broke my heart' ?
? FC Bayern TV pic.twitter.com/zSiqKmotOH
— Empire of the Kop (@empireofthekop) May 19, 2017
What do you think, Liverpool fans, would your team and Gerrard have collected more silverware if Alonso could have been persuaded to reject Madrid’s advances?