Belgium beat five-time champions Brazil 2-1 in Kazan on Saturday morning (AEST) to qualify for the World Cup semi-finals, where they will face the 1998 winners France at St. Petersburg Stadium on Wednesday (AEST).

"There are always many ups and downs," Lukaku said post-match.

"I work a lot and I'm fully focused on the things that I'm doing now. I know that as long as I continue working hard, things will get rolling.

"Now everything's fine not only for me, but for the whole team. As long as my team are doing great, I'm truly happy."

The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.