The fit-again Holland fullback, having recovered from an ankle injury, was superb in Sunday's 5-2 rout of Roma.
The win has Inter now sitting seven points clear at the top of the Serie A table with seven games to play.
Dumfries told Sky Italia: "I've certainly never had an injury like this before. It's difficult, but now I'm very positive and looking forward to finishing the season: we need to win some games to win the Scudetto, that's our goal.
"I played a good match against Roma, which is important. Now in Como we need to win and play well. I'm not looking at Napoli or other teams, just Inter: that's important. We need to work hard, every game is a final, we want to win both trophies (Serie A and Coppa)."
Dumfries added: "I'm very happy at Inter, this is my family, and my only focus is on winning these titles."