Fabregas put the Blues ahead, but was among a host of Chelsea players who wasted numerous chances to grab a winner at Stamford Bridge.
Klaas Jan Huntelaar's equalizer midway through the second half saw Jose Mourinho's side drop points against a side who have only picked up one point from their opening three Bundesliga matches this season.
Nonetheless, Fabregas was in defiant mood shortly after the final whistle as he promised On Twitter that the London side "won't give up".
We won't give up! pic.twitter.com/T6SmFYhyuT— Cesc Fàbregas Soler (@cesc4official) September 17, 2014