Hazard completed his long-awaited switch from Chelsea last summer, but other fitness issues meant he already missed 18 games in all competitions prior to the new ankle fracture he suffered in a league fixture against Levante in late February.
It means that having joined Real in order to take his career to the next level at his prime, Hazard has been cruelly limited to just 15 total appearances for the club, scoring only once.
Terreur also explained that the timeframe for his likely return will only be known once the surgery has been done, although Real do hope to have the player back before the end of the season.
Even without Hazard for much of the campaign, Real are now leading La Liga in the title race following Sunday night’s Clásico victory over Barcelona at the Bernabéu.
During the Belgian’s last injury absence – the result of a foot fracture which kept him out of from late November until early February – Real were unbeaten in 10 league fixtures, winning seven.
When Hazard returned from that layoff, Real were held to a 2-2 home draw by Celta Vigo and were then beaten by Levante, the game where the player suffered his latest injury.
Neither Real nor Barcelona have been at their best this season, with both teams fully in a transition period. Last season saw Barcelona top La Liga with 87 points, the first time any Spanish champions have recorded less than 90 points since 2008/09.
But this season, unless either side finds some consistency and form in the final stretch of the campaign, whoever wins it is on course to finish with little more than 80 points.
That would be the lowest since Real were crowned champions with 76 points in 2006/07 and certainly a far cry from when both sides managed 100 points in the early 2010s.