Rondon, on-loan from West Brom, wants to sign permanently for Newcastle.
Benitez said: "We knew him before. We knew he could be fine for the way we wanted to play. I was pleased with him and I have been talking to him about what he is thinking.
"He is clear on wanting to score goals. I have talked with him about football, I asked him about what was going on. We had the same message, it is to carry on scoring goals.
"If he scores goals, it will be easier for him. It is better for him not to think about the future and just to score goals."