Midfield
The former Bayern Munich player has had a comparatively silent Champions League campaign with just one assist. But don't judge him by his numbers.
Toni Kroos has the ability to split any defence with his passing range. Nullifying the Real Madrid midfielder is one of the things the Liverpool midfield should focus on this weekend.
Closing down Kroos would result in the reduction of supply to Cristiano Ronaldo, which in turn would make things easier for the Reds. But that is easier said than done.
Shutting down Kroos might not be enough as the German's partner Luka Modric can cause as much problems as his German partner.
Modric and Kroos are two of the best passers of the ball in the game, and their opponents cannot afford to give them free space or time at any cost.
Invalidate the two midfield maestros and Liverpool have a good chance of winning the tie on the big day.
Liverpool vice-captain James Milner is probably the most consistent and versatile player from both sides. The old-school midfielder might not be as fancy as his counterparts but surely does know how to get things done on the pitch.
Milner broke the record for the most number of assists in one Champions League season - a record that once belonged to Neymar and Wayne Rooney. And he would love to add to the tally in Kiev.