Romelu Lukaku was a modest man despite Belgium’s 5-2 thrashing of Panama on Saturday at the Spartak Stadium in Moscow.With two thumping three-goal wins over Panama and Tunisia in their two Group G fixtures so far, Belgium became the fifth team to qualify for the 2018 FIFA World Cup round of 16s but the the big man feels that Belgium need to improve further and that will be their goal against England.”We can still do better. It is important we did better than in the previous match. That is what we did. Against England we still have to do better,” said the striker.2018 FIFA WORLD CUP: FULL COVERAGEAlready by far Belgium’s top scorer in all international competitions with 40, at just 25 Lukaku is carrying high hopes that he is the final piece in a jigsaw — providing the clinical finish that intricate build-up play from the likes of Eden Hazard and Kevin De Bruyne has provided in recent years. But, he is not ready to take credit for his impressive run and feels that all the attackers were good and played a part in the win.”Today all the offensive players were able to bring something and the defenders were there too. As a team we keep improving,” he said,With four goals from two matches now, the Manchester United forward is now the joint top scorer in this year’s World Cup along with Cristiano Ronaldo. Ronaldo scored a hat-trick in his first match against Spain and then netted the winner against Morocco while the Belgian has scored two each against Panama and Tunisia. On Saturday, he had the chance to score a hat-trick but his stay on the pitch was cut short due to a niggling heel injury he picked up during the match and was subbed off after on the hour mark.World Cup 2018: Romelu Lukaku equals Diego Maradona’s 32-year-old recordadvertisement Lukaku picked up an injury during the match against Tunisia (AP Photo)But, he has no regrets and said that it is nothing serious but a regular check will be one soon.”I could have gone off right away but I wanted to push it. We’ll see with the physio tomorrow.”Lukaku has started the World Cup from where he left off for Manchester United in the Premier League. Having scored 27 goals for United after making his move from Everton, the Belgian was coming to the World Cup high on confidence and he has only got better in every aspect. And, his national manager Roberto Martinez was all praise for him.FIFA WORLD CUP: FIXTURES | POINTS TABLE”It’s not easy to score that amount of goals in two games,” said Belgium coach Martinez following their 3-0 opening win over Panama.It remains to be seen if he starts against England on Thursday but if he does, the English defence will have a task on their hand in keeping Rom quiet.