The Colombian has been injured since February but is working hard on his fitness in a bid to recover in time for the tournament in Brazil this summer
The former Atletico Madrid striker has been sidelined since February with an anterior cruciate ligament injury and was initially expected to miss the tournament.
However, he has been working hard on his fitness and was named in Jose Pekerman's preliminary squad. He accepts, though, that he will not go to Brazil if he does not recover sufficiently.
"To get to 100 per cent football-wise will be impossible, because I lack hours of competitive football," he is quoted as saying by Marca.
"In order to resume, if I am feeling good, I will go. If I see that I am not sure, and I'm not going to contribute anything, I will be sensible and I will not go.
"I'm getting better every week. My knee has evolved well and I'm happy about that. My knee is fine.
"I work in a simple manner every day. I am getting used to coordination with the ball."