The Nerazzurri are in second place in Serie A and trail Antonio Conte's men by four points.
Guarin scored what turned out to be the winning goal in Inter's 3-2 victory over Genoa last night.
"We're slowly getting to where coach Andrea Stramaccioni wants us to be, by working hard and winning games," said Guarin.
"Now we can focus on the Bianconeri and we'll fight to win that match."
Inter have won the Scudetto 18 times.