Spurs boast a record of four consecutive victories away from home, scoring a remarkable 13 goals. That run began at Fulham in the previous round of the competition.
Robbie Keane has scored six goals since Tottenham's form turned at Craven Cottage, including two against Bolton at White Hart Lane a fortnight ago.
Jose Mourinho told ChelseaFC.com: "They are living a good moment. They are scoring a lot of goals and they are winning matches. Tottenham have not just good but very good attacking players."
"I know it is a difficult game to play but when you play in these stages of competitions, there are no easy draws. If we want to be in the Final, we have to beat the best teams."