The Australian netted for the Reds legends against the Spanish side's own famous figures.
The Australian winger shone at Leeds United and had the talent to succeed at Anfield. Sadly, however, his injury record did him no favours during his time with the Reds and whatever could have been never happened.
The moment that sums Kewell's Liverpool career up, of course, was the Champions League final in Istanbul in 2005. It meant so much to the Kop and was arguably the greatest match of all time - certainly the greatest comeback.
For the winger, though, it was yet more agony, as he limped off injured in the first half.
Kewell was still invited to the Liverpool legends clash against Real Madrid this weekend, however, and, to many people's surprise, he opened the scoring with a header of all things. Indeed, the 36-year-old's goal was later added to by Michael Owen, only for Madrid to spoil the part by hitting back with four of their own.
But, for Kewell, this was still a very nice occasion indeed. It was great to see the former Liverpool man hit the back of the net and it was a reminder that, despite the fitness issues, inside that Australian was a player of real quality. Here's how Reds fans reacted on Twitter to his display:
We should be looking at signing or at least monitoring that Kewell guy #LFC— William (@LFCbilly07) June 14, 2015