Marcos Alonso's late header was enough to give Chelsea a 1-0 win at Slavia Prague in the first leg of their Europa League quarter-final on Thursday night.
The Blues put in an underwhelming performance on the night, with several squad players failing to take advantage of the playing time opportunity gifted to them by Maurizio Sarri.
The Czech league leaders, who knocked out Sevilla in the last round, were impressive in their commitment levels, and pressed Chelsea high up the pitch from the start, something which Sarri's side found difficult to adapt to.
Slavia may have shown that they deserve to be at this stage of the competition, but the Blues' quality eventually showed.