The European champions had long gone in the front early inside the 2d half of at Stamford Bridge via Antonio Rudiger's sensational long-range strike, however they collapsed to lose for the primary time seeing that proprietor Roman Abramovich become hit with the aid of UK authorities sanctions.
Vitaly Janelt levelled only a minute later to spark a three-aim spree in 10 minutes for the site visitors.
Eriksen has been in best form considering the fact that making his return to aggressive football in view that struggling a cardiac arrest on the sphere during Euro 2020.
The former Tottenham midfielder scored two times in as many video games during his global comeback for Denmark and endured his scoring streak via lifting the ball over Edouard Mendy to finish the turnaround.
Janelt then made it 3-1 with a deft dink over Mendy on the hour mark.
Third-positioned Chelsea continue to be on direction to finish within the top four but will want a main improvement for the go to of Real Madrid in the Champions League zone-finals on Tuesday.
Yoane Wissa rounded off a memorable afternoon for Thomas Frank's men whilst he took gain of greater comical Chelsea defending to drill home a fourth.
A third win in four games takes Brentford as much as 14th and 11 points clean of the relegation sector.
