Gallery: Ten players to watch

Henrikh Mkhitaryan, Shakhtar Donetsk

Mkhitaryan has been on fire this season for the defending Ukranian champs, scoring 20 goals in his first 26 appearances in the league and domestic cup. The 24-year-old and his club will be in tough against Dortmund in the Round of 16, in which the three-time Armenian Footballer of the Year will be depended on if Shakhtar hope to have any chance to advance.