QPR were battered at Craven Cottage, with two goals from Ross McCormack and strikes from Ben Pringle and Mousa Dembele condemning them to a heavy derby defeat.
However, Fer believes that the support his teammates received from the stands was second to none, and has assured QPR's followers that an improvement is on the horizon.
“They've been amazing. I want to thank them for their support because, even at 4-0, they kept singing for us and showed the love for the club.
“We have to know this as we're playing for them. I want to thank them and say next week is going to be different. This can't happen anymore.”
Fer made his first appearance of the season during the match, as he came on at half-time to try and help his side salvage something from the match.
Although he was unable to improve QPR on the night, there is still high hope regarding the impact the Dutchman can make this term, as he is one of the most talented midfielders in the Championship.
QPR will need him to hit the ground running, though, as there is plenty of discontent around Loftus Road at the moment.
The R's have failed to win in any of their last four matches, and calls for current boss Chris Ramsey to be replaced will only intensify if the corner is not turned soon.