Widely regarded as one of the team’s most dangerous attacking players, Doku’s pace, dribbling ability and one-on-one threat have become key components of Belgium’s attacking approach.
With the winger unavailable, Leandro Trossard is expected to shift to his preferred role on the left flank, while competition has intensified for the vacant spot on the right side of the attack.
Dodi Lukebakio, Alexis Saelemaekers and Charles De Ketelaere are all being considered as potential replacements in the starting lineup for the important Group G contest.
Belgium can ill afford another setback in what has become one of the most closely contested groups at the tournament.
Following the opening round of matches, all four teams in Group G, Belgium, Iran, Egypt and New Zealand, are level on one point.
As a result, the clash against Iran has taken on added significance, with the Red Devils eager to secure a victory that would strengthen their chances of progressing to the Round of 16 while they await Doku’s return to action.