Benteke is Liverpool's second highest scorer this season, but his return of eight goals in 33 games has done little to repay the reported £32.5million spent to bring him to Anfield from Aston Villa.
His compatriot Romelu Lukaku is joint second in the Premier League's scoring charts with 18 strikes to his name, while only Zlatan Ibrahimovic and Edinson Cavani have scored more than Marseille striker Michy Batshuayi's 13 Ligue 1 goals this term.
Perhaps even more worrying for Benteke, Liverpool manager Jurgen Klopp has shown a recent preference for Belgium youngster Divock Origi in his starting XI.
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The former Lille forward started this month's wins over Manchester City and Crystal Palace, a game that Benteke sealed with a late penalty, while the former Villa man's last start came at West Ham in early February.
And Wilmots told Het Nieuwsblad: "It's difficult. Klopp arrived at Liverpool and has made his choice. Now, Christian Benteke is full of doubt.
"It's a shame for Benteke, but he still has time to show what he can do at Liverpool. He already missed the World Cup due to injury, missing the Euros would be painful for him.
"I will choose according to the profiles, not on the form of the last two months or anything like this.
"Batshuayi is a goalscorer, a penalty area player. Benteke is better with his head and in combinations. Lukaku is strong and fast."