The defending Premier League champions have lost seven of their 12 matches to sit only three points above the relegation places, and some 15 points off the pace set by Manchester City and Arsenal.
It is a dramatic turnaround from last season, when they cruised to the title while also winning the League Cup.
"The season is f*****," Fabregas told Spanish newspaper Marca.
"Things aren't working out and the results aren't doing our performances justice
We're playing better but aren't having any luck.
"When things are going your way, you flick the ball with your heel and it flies into the top corner, whereas now every piledriver is going off target.
"Either way, we need to get back to winning ways sooner rather than later."
Fabregas is among the players singled out as having underperformed, while manager Jose Mourinho's future has been repeatedly questioned, but the former Barcelona midfielder insisted he still had the trust of his manager and vice versa
"Things with Mou are good," he said
"Obviously when you're not winning things always get said, whereas when you're winning everything's rosy
When you're not winning everything is that much harder, but all of us - the players, fans and the coach - have to pull together and hang tough
"We're the only ones who can turn things round
Nobody is going to give us a helping hand
We're still in a position to challenge the big boys in the Champions League, but in the Premier League we need to get our act together right away."
Source : PA