Hazard has been a key figure for Premier League leaders Chelsea this season but Wilmots believes that the 23-year-old has not produced his best regularly enough in international football.
"If one day, I feel it is not in this spirit, I will do without him," the 45-year-old told L'Avenir.
"He needs to improve his stats with the national team. Five goals, including two penalty kicks, in almost 50 games? This is not enough.
"I scored 29 times for Belgium and was less talented. Eden, I love him, but I ask him to be more decisive."
Hazard made his Belgium debut as a 17-year-old in 2008.