He now has no doubts the frontman will continue his hot-streak once he returns to Merseyside following a final qualifier against Wales on Tuesday.
"I don't think it was a surprise for any Evertonian or anyone who has seen Romelu play in the last few games," Martinez told evertontv.
"He's been very consistent, has maintained an important level with us and he brought that into the Belgium game. He is a very confident footballer and he can have that sort of impact in any game he plays.
"I don't think he is a player who relies too much on good moments of form. He is a player who looks after himself in a pristine manner and that means he is always ready for whatever happens on the pitch.
"I think we are going to have Romelu Lukaku very incisive and very effective for the rest of the season."
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