Cech clashed with the 32-year-old on several occasions during Alonso's Anfield years, with the Reds knocking the Blues out in the 2005 Champions League semi-final before going on to win the competition.
Chelsea got their revenge years later, while Alonso never won a Premier League title during his time on Merseyside.
Cech, though, still has strong memories of the Spaniard and says the midfielder is another member of the golden generation that can 'never' be forgotten.
And the Blues shot stopper understandably took the time to praise Alonso's passing, in particular.
Another from the golden generation retired from international football... You can never forget his brilliant passing! pic.twitter.com/E0PjggDCRn— Petr Cech (@PetrCech) August 27, 2014
Alonso traded Liverpool for Spain in 2009 after five years at Anfield, when he moved to Real Madrid.
Since then, the 32-year-old has won the Champions League once more, while also lifting the Copa del Rey and La Liga trophies.
His last game for the Spanish national side was their 3-0 win against Australia at this summer's World Cup in Brazil.
Alonso retires a previous world and double European champion, one that - as Cech demonstrates - will be remembered for his phenomenal passing ability.