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Milan travelled to Old Trafford for the first leg of their semi-final clash in Europe's top-tier club competition.
Cristiano Ronaldo opened the scoring for Sir Alex Ferguson's side in the opening 10 minutes at the Theatre of Dreams.
However, United would fall 2-1 behind by half-time as Kaka showed off his full brilliance during the peak of his powers.
The 38-year-old Brazilian, who retired from football in 2017, scored a first-half brace as Milan made a comeback at Old Trafford.
BT Sport has since uploaded footage of Kaka's superb performance as fans reminisced about the 2007 Ballon d'Or winner when he was in his element.
"Kaka was undoubtedly the best player in the world at this time," one fan posted.
Someone else added: "Shame his prime was short-lived, but at the peak of his powers he was unplayable. Quality."
A third said: "One of the best performances I have seen this. Remember it like it was yesterday."
And a fourth wrote: "Kaka really dealt with Man Utd over the [two legs]. Nobody could handle his pace and vision."
Kaka's performance might have been dampened by United's comeback as Wayne Rooney scored a brace to seal a 3-2 victory for United.
However, Kaka would return to haunt the Red Devils as he opened the scoring in the return leg at the San Siro.
Clarence Seedorf and Alberto Gilardino also added their names to the scoresheet as Milan dumped United out of the semi-finals.
Milan clashed with Liverpool in the Champions League final and Filippo Inzaghi's brace sealed a 2-1 victory at the Olympic Stadium in Athens.
Kaka left Milan in 2009 to complete a sensational £56m move to Real Madrid, but the Brazilian was marred with injuries during his time in Spain.
Featured Image Credit: YouTube/BT Sport
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