"I was frustrated and I was angry," the striker told Telefoot.
"You always tell yourself what would have happened if I were there. We don't know, and that is what frustrates me because, for me, we were better than Chelsea.
"We lacked three minutes in the end and, for me, it was like a warning. I think we learned a lot from this experience and this will help us next year for clinching the Champions League."
Ibrahimovic missed the second leg of the clash through injury.