Inter clinched a crucial 3-2 win against Gladbach.
"As I said, I am one of the 25 players. There are far more experienced players here than me. I want to help the team to win, that's what I do in every training session and every match, I want to help Inter," Lukaku told Sky Sport Italia.
“I am so happy to be here with these lads, I've had the best year-and-a-half of my career at Inter, so I thank the coach, his staff and my teammates.
“We should've killed off the game, we were 3-1 up and were fortunate with VAR that the equaliser was disallowed. Having said that, we should not be negative, as there are many young players and we are improving."