Terry's injured. Hazard played OK, but swapped shirts at halftime, so the crowd weren't happy. He also asked to be taken off in the second half, which upset them even more.
Chelsea looked fairly impressive to begin with and Costa was by far the most dangerous striker, he totally terrorised PSG's defence. They also forced the PSG keeper into several decent stops before Costa's goal.
Their defence wasn't great, though. Kenedy looked like a very inexperienced teenaged winger asked to play left-back - which is what he is - and PSG had the freedom of the pitch down that flank.
Once Costa went off, Chelsea wilted and PSG took full control, Di Maria and Zlatan were very impressive.