Real Madrid manager Zinedine Zidane says that the rivalry between Los Blancos forward Cristiano Ronaldo and Barcelona talisman Lionel Messi has helped to make both players even stronger and better. Ronaldo and Messi battle for the for the 2017 Ballon d'Or, of which the winner will be announced on Thursday, if the Portuguese skipper emerges victory as he going to equal his arc-rival the Argentina international on five occasions.Ronaldo has been struggling for form at just netting only two La Liga goals from 10 appearances but the 32-year-old is still expected by many to claim the prize, thanks to the role in he played during the Los Blancos triumph by winning the Spanish La Liga and Champions League last season.\Real Madrid coach speaking at a news conference ahead of Wednesday's clash with Borussia Dortmund, Zidane said:“It’s true that you look at his statistics and they’re just incredible and amazing. "It's surprising to see the number of goals Ronaldo and Messi have scored, actually. They're two great players."Both make each other better. This battle will be around for a long time to come.Real Madrid host Bundesliga outfit at Santiago Bernabeu before returning to La Liga to clash with Sevilla at the weekend.