The 26-year-old missed seven months of football due to an anterior cruciate ligament injury but made his comeback in the 3-1 defeat at Manchester City.
The Argentine completed 90 minutes in the Capital One Cup victory over Walsall last week but was still surprised when asked to start against the Premier League champions.
"I didn't expect to be back so soon. My target was to come back after the international break but football is like this," said Faurlin.
"I am not quite there yet but I have to take the positives from all this. I am very happy to come through two games in one week after seven months out.
"I feel I am 70% fit at the moment. I just need to get that sharpness back and this will come by playing games."
QPR host Chelsea on September 15 in the Premier League.