Chelsea left it late to secure a 1-0 win in their Europa League quarter-final first leg at Slavia Prague.
Marcos Alonso timed his run perfectly to meet Willian’s right-wing cross with a firm header four minutes from time in Prague.
Maurizio Sarri’s under-strength side struggled to find any rhythm for large spells, but grew into the game after Eden Hazard was introduced off the bench just before the hour mark.
The second leg at Stamford Bridge takes place on 18 April.