Both teams suffered defeat in their first group games of the 2013-14 edition of the tournament, and will be looking to bounce back immediately by earning a win at Stadionul Steaua.
The hosts' found themselves on the wrong end of a 3-0 drubbing from Schalke on matchday one, with Atsuto Uchida, Kevin-Prince Boateng and Julian Draxler notching for the German club.
Chelsea, meanwhile, slumped to a 2-1 loss to Basel at Stamford Bridge, as goals from Mohamed Salah and Marco Streller cancelled out Oscar's efforts to hand the Swiss outfit three points.
These teams met at the second knockout round of last season's Europa League, which Chelsea went on to win courtesy of victory over Benfica in the final.
But the scorers of both of Steaua's goals in that tie no longer play for the club, with Raul Rusescu having joined Sevilla and Vlad Chiriches electing to leave for Tottenham.
Though Chiriches did not feature in the game, Chelsea's last outing in fact came against Tottenham, with Mourinho's men picking up a hard-earned point at White Hart Lane with a 1-1 draw.
