Barca host City defending a 2-0 lead.
Messi told the Daily Star Sunday: "Of course. I feel just as passionate about football as before.
"I don't know why anyone doubts it and asks me this.
"I will always be passionate about playing football as long as I can.
"It was a really good win for us at City because we got our confidence back for the big Champions League nights.
"We proved that we are still a really good team when it matters."
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