Arsenal's Dani Ceballos celebrates after scoring his side's second goal during the FA Cup sixth round match between Sheffield United and Arsenal(AP)

The two sides from London join Manchester United in the last four

Chelsea reached the FA Cup semi-finals on Sunday as midfielder Ross Barkley came off the bench to secure a deserved 1-0 victory at faltering Leicester City.

Barkley slid home the winner in the 63rd minute as the west London side joined Manchester United and Arsenal in last four.

Earlier, substitute Daniel Ceballos fired Arsenal into the semi-finals with a stoppage-time goal that sealed a 2-1 win over Sheffield Unitedy.

Arsenal went ahead after 23 minutes when Chris Basham fouled Alexandre Lacazette in the penalty area and Pepe rattled home the spot-kick.