Defeat at home to Borussia Dortmund has Milan's hopes hanging by a thread.
But Pulisic says: "We had the opportunities, at the end of the first half and at the beginning of the second. Only our lack of attention allowed them to score 1-2, it was tough.
"I think it's never over, we still have a chance to get through. Today we had a great opportunity, but we wasted it.
"We can control what we can control and try to win against Newcastle. The fans were fantastic, the atmosphere was beautiful, they pushed us. It's bad not to have made it."