Julen Lopetegui is going to have to find 50 goals a season from somewhere now that Ronaldo has gone but he wouldn't get them from the Chelsea attacker. No player in the world can simply replace Cristiano Ronaldo.
Whatever happens from here, Real Madrid have got to reconcile themselves to the fact that they’ve just kissed goodbye an average of 50 goals a season that Ronaldo got throughout his nine campaigns at Santiago Bernabeu.
Under Zinedine Zidane the team was structured to extract goals from Ronaldo. In all competitions he scored 44 times last season. He may well have been named on the left side of the Madrid attack but he certainly didn’t play there.
The days when Ronaldo gallops at his full-back and whips in a cross or a shot as his primary attacking moves are long gone. He’s a striker and a pretty good one at that.
His game has become about first-time instinctive finishes, clever runs into the box and anticipation. What’s more, it requires the rest of the individuals set within the attacking formation to cater for him.
Madrid have lost that crucial decoy in their attack. Among the players they currently employ, there is nobody who can do what Ronaldo did – either in front of goal or simply to alarm an opposition defence by his very presence.

source: https://www.infonewsnigeria.com/discussion/2371/no-player-in-the-world-can-simply-replace-ronaldo-at-real-madrid#latest