#2 Eden Hazard
It is not just Chelsea who need to be worried about their opponent's talisman as they have one of their own who can turn the tie on its head. Eden Hazard remains one of the top players in the Premier League and when in form, there is barely any defender in the world who can stop him.
The Chelsea No.10 is once again hitting form in recent weeks with six goals in his last six league outings, playing either as a left winger or as a forward. Now, considering the fact that Barcelona's first-choice right-back in the Champions League, Nelson Semedo, is set to miss the first leg due to suspension, the Spanish side have more than enough reasons to worry.
Semedo's replacement will very likely be Sergi Roberto, who is no slouch but is primarily a midfielder. Thus, if Hazard starts on the left with either Alvaro Morata or Olivier Giroud up front, then the Belgian can put the tie firmly in Chelsea's favor before the second leg even begins.