The 23-year-old Belgium international's injury is "not serious" though.
Lukaku, who has scored 17 goals this season, is expected to be fit for Everton's next Premier League match on 25 February at home to Sunderland.
He is one goal away from equalling Duncan Ferguson's club record of 60 goals in the Premier League.
Everton striker Romelu Lukaku will miss the club's training camp in Dubai this week to visit a doctor in Belgium for treatment on a minor calf problem.