Chelsea head to the Mestalla next knowing a two-goal win would send them through, but defeat would likely leave qualification out of their hands.
"It's going to be a huge game for us," stressed Pulisic to chelseafc.com.
"We just have to go there and get a result, and we are looking great to go through.
"It's going to be really tight. It's makes those next games that much more important. We know what we are capable of, and we just need to keep going."