The 22-year-old has been sidelined since the Villans' 1-0 win over Norwich in September with a hip injury, but was an unused substitute for Belgium against Wales
Benteke, who has not appeared for his club since injuring his hip flexor on September 21 away to Norwich, was an unused substitute for his national side's final World Cup qualifying match against Wales on Tuesday.
And Lambert is optimistic his star striker will be available for Sunday's clash with Tottenham at Villa Park.
"He'll come back and will know himself how he's feeling," Lambert told the club's official website.
"All I know is he was on the bench last night, trained for a couple of days and hadn't had any reaction. That might change when he gets back - we'll wait and see.
"I trusted Christian to be honest, which he is. That's all you can do - trust somebody to do the right thing.
"Obviously he didn't play against Croatia and he was on the bench last night. I trusted him."
Lambert also revealed he is yet to receive a fitness update on the remainder of Villa's international contingent.
"They're not back yet," he continued.
"There's nine of them away so we'll get reports this morning and see how they are."