Chelsea were bought crashing back to Earth after Southampton stunned them on Boxing Day.
The Blues had been so dominating in the London derby just days before, but produced a poor performance which saw the relegation-threatened Saints win 2-0.
Frank Lampard’s side came into the fixture riding a wave of momentum after defeating Tottenham last week. However, they came unstuck in the first half as teenager Michael Obafemi capitalised on a comedy of errors to curl into the far corner against the run of play.
Lampard reverted from a back-five at half time and introduced Mason Mount, but his side still struggled to inspire any openings in Ralph Hasenhuttl’s well-organised defence.
Michael Obafemi and Nathan Redmond scored a goal in each half as Southampton won at Stamford Bridge and continued their festive revival.
For Chelsea, it was a third defeat in the last four home games in the Premier League and a blow to their top four hopes.