That's gonna be a very big achievement for lukaku if he will able to take the trophy that is one step away from his face. City has become the biggest wall for intermilan to win it right now. I know that will not be an easy task to beat manchester city. Even mostly people thought that if intermilan has very small chance to win against city caused by city has owned the best squads in the world right now. It will be disappointed if lukaku will be missing UCL trophy caused by it's one of his dream.
Lukaku is a very strong man in mentality that helped him to survive through many challenges in his career. From Anderlecht, Chelsea, West Brom, Manchester United, Inter Milan, Chelsea, Inter Milan, he has many chaos in his career. There are some seasons when Lukaku was under deep mud at Chelsea (two times), Manchester United and even Inter Milan with this season.
However we can not deny that Lukaku is a very dangerous striker when he is in form when his strength covers all his weaknesses. If he can win Champions League, we should congratulate him about that but if he won't, I don't feel any regret. Even Ronaldo Brazil, Ibrahimovic, Totti did not win Champions League and frankly Lukaku is far in quality than those legendary players.