5. Controversial 

The no nonsense referee has a reputation of being harsh on English club players in European competition. Çakır has sent off Nani, Steven Gerrard, John Terry and Mario Balotelli in the past. There will be no Premier League representatives in the final but the experienced referee is consistent with his decisions regardless of the competition and league. Çakır is not afraid to brandish cards and make big calls but does allow the game to flow and only averages 4.06 yellow cards per game, 0.21 red cards per game and 0.29 penalties per game.