Liam Rosenior says it was a Mamadou Sarr error - rather than his tactics - that set Chelsea on the way to a humiliating Champions League exit.
Trailing 5-2 from the first leg, the Blues fell to another humbling defeat, this time at Stamford Bridge, as Paris Saint-Germain ran out 8-2 winners on aggregate in a one-sided last-16 tie.
