Leicester City beat Chelsea 2-0 on Tuesday to go top of the Premier League, for 24 hours at least, thanks to goals from Wilfred Ndidi and James Maddison.
Leicester have 38 points from 19 games but Manchester United, on 37 points, can return to the top with a victory at Fulham on Wednesday.
Chelsea's third defeat in five matches dropped them to eighth place, nine points behind the leaders.
Leicester took a sixth-minute lead when a short-corner ended up half-cleared to Ndidi on the edge of the box and his shot flew in off the inside of the post.
Chelsea were awarded a penalty in the 38th minute when Jonny Evans brought down Christian Pulisic, but after a VAR review, the challenge was ruled to have occurred just outside the area and Mason Mount blasted the free kick over the bar.
Within three minutes Frank Lampard's side went from the brink of an equaliser to being 2-0 down when Chelsea's defence failed to deal with a high ball from Marc Albrighton, which fell to an unattended Maddison whose composed finish gave Edouard Mendy no chance.
Chelsea substitute Timo Werner had an effort ruled out for a narrow offside in the final stages but the Foxes were good value for their win.