Liam Rosenior said it is his job to make sure Chelsea’s season is not derailed after they were beaten 3-0 by Paris St Germain at Stamford Bridge to exit the Champions League 8-2 on aggregate.The result marked a heaviest-ever two-legged defeat for the Blues in Europe and just like in the first leg at the Parc des Princes, it was individual mistakes which were their undoing.Mamadou Sarr, brought in for his debut in the competition with Reece James and Malo Gusto ruled out, made a horrible error to gift Khvicha Kvaratskhelia a goal after six minutes and things only got worse from there.