Familiar foes go head-to-head for today's early Premier League kick-off, as Ralph Hasenhuttl meets Thomas Tuchel for the first time on English soil.
The two former Bundesliga bosses met four times during their time in the German top flight, with Tuchel coming out on top on three occasions.
Now, two teams with very differing recent fortunes are set to do battle. Chelsea are undefeated since Tuchel's arrival, with Southampton have experienced a miserable losing run recently under Hasenhuttl's guidance.
Earlier in the campaign when these sides last met, a thrilling 3-3 draw played out with twists and turns aplenty.