Tottenham's Champions League hopes were dealt a damaging blow as they fell to a 2-0 Premier League defeat by Chelsea at Stamford Bridge.
Ange Postecoglou's side were left trailing fourth-placed Aston Villa by seven points and now have just a single game in hand.
Goals from Trevoh Chalobah and Nicolas Jackson saw Mauricio Pochettino emerge victorious against his former club to enhance his team's own chances of qualifying for Europe.
This was far from Spurs at their fluid, swashbuckling best, and rarely did they put serious pressure on a Chelsea backline that had already posted the club's worst league defensive record in more than 30 years.