Lukaku has no doubt they blew a great chance of being world champions last summer.
"We did not have room in the system that we played at that time. The final whistle was terrible. We lost the game of our lives against a team that did not really deserve to move on to the final," said the 25-year-old to RTBF.
"Yes, they became world champions, congratulations, but actually it was the moment to play the final for this generation."