Nadal only recently returned to competition after a seven-month layoff but has so far decided to play in clay court tournaments in Chile, Brazil and this week at the Mexican Open in Acapulco.
"My intention is to go to Indian Wells, my priority is to play there, but if I don't feel comfortable and I'm not OK then I will have to take a decision," he said after a 6-2, 6-2 win over Sebastian Schwartzman in his opening match in Acapulco.
"These media companies cannot know more than me," he was quoted as saying by Spanish media on Wednesday.
The 11-time Grand Slam champion insisted, however, that his main objective was still finding full fitness and form before a busy stretch of European clay court tournaments leading up to the French Open at the end of May.
"My day-to-day objective is to recuperate the knee until it gets back to 100 percent and I am able to return to competing and full training as quickly as possible. If I don't recover, we will accept it and deal with it calmly and continue being positive."
Nadal has shown few signs of rustiness on his return so far as he reached the final in his first tournament back in Viña del Mar, Chile, before winning the Brazil Open a fortnight ago.
However, the World No.5 insists it is taking some time to recover his best form after such a long spell out.
"You need to recover the speed and concentration that only comes with competition and seven months without competing takes its toll," he added.
The Majorcan star's uncle and coach Toni Nadal also denied that any final decision had been taken on his nephew's schedule for March but did warn that playing on hard courts could be more damaging to his knee than his favoured clay court surface.
"We need to be cautious on when Rafa returns to a hard court but the fact is that Rafa feels really good in Acapulco and at no point has he said to me that he has decided not to play on the hard courts in the USA," he was quoted as saying by sports daily As.