The 38-year-old tweeted his thoughts on the game for Heineken throughout the encounter, as part of their '#ShareTheSofa' night, and felt the Blaugrana were simply too good for a struggling Milan side.
Goal compiled a list of our favourite tweets from the Argentine during and after the game, including his thoughts on the problems facing Massimiliano Allegri's side and Lionel Messi's return to form.
CRESPO ON MILAN
"AC Milan are doing everything they can here - Barca are pushing them further and further back."
"As I said, Milan can't afford to give away the ball in their own half - Barca punish that every time."
"Losing 3-1 show that Milan have a lot to prove if they want to get back to the old times."
CRESPO ON MESSI
"Messi never takes penalties like that. You can see the pressure he's feeling from not scoring in the last four games."
"He kicked the ball in the middle, praying that the keeper would go down. Hope this gives him some confidence."
"He's always so good with that perfect first control; he stops the ball and makes the shot look easy."
CRESPO ANSWERS SUPPORTERS' QUESTIONS
What is your favourite stadium you have played in?Crespo: "The old Wembley. So proud of what happened there. So much history."
So Hernan Who do you think will win the champions league this season?
Crespo: "A lot of teams are work in progress. Man U with Moyes, Bayern with Guardiola."
Crespo: "The two goals in the Copa Libertadores final - I was 20-years-old, in front of 90k people."