While Fernandes, who took over the club less than a year ago, thinks most of the good work has already been done, he admits as many as three new faces could still arrive at Loftus Road.
"It is ironic, this time last year I had one week to do it all," he said.
"Now I've had the best part of two months and I think a lot of great work was done.
"We have never said this before but the moment the Man City game [on the final day of the season] was over, we started working.
"There was one night of celebration and then the guys started working on the squad.
"That is why we've hit the ground running, been able to make six signings and renew Adel [Taarabt's contract].
"It's good as it gives Mark a lot of time to gel the squad as obviously there are a lot of new faces that haven't played with each other.
"It is not going to be perfect to start off the season but we seem to be doing the right things there.
"Maybe two or three more signings are left and then we're done - and, I think, done for a while actually because we would then have a good nucleus for a long time.
"The work then has to start on the academy and bringing through kids, who started at QPR at 11 and go all the way up.
"That has been a poor end of QPR as we haven't had many players progress from the academy to the club itself."