Immobile had struggled to score at international level.
"I felt a weight off my shoulders, because I hadn't scored from open play for a year and a half in the Italy shirt," Immobile told RAI Sport.
“I slipped on the first chance, the goalkeeper was there on the second, so I was feeling frustrated and let it all out after the third chance went in.
“Having competition for places only makes you more determined to find the net and help the team. Gallo Belotti scored last time, I got the goal this time, so there needs to be more faith in this Italy side."
Immobile also spoke of the loss of Lazio youth team player Daniel Guerini, who was killed in a car accident this week.
“My thoughts go to Daniel and his family. This victory is dedicated to them, as they are going through something that you wouldn't wish on your worst enemy.
“We are stunned and truly sad for what happened to this young lad and send our condolences to his family."
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