Can Cristiano Ronaldo be replaced?What's the story?
However, the West London club now faces a hard task of keeping hold of their star player at Stamford Bridge this summer with club talisman Eden Hazard at the top of many top clubs' wish list.
The deal would eclipse that of Kylian Mbappe's move to Paris Saint-Germain, but would not be quite as much of Neymar's mouth-watering transfer from Barcelona.
Ronaldo officially left Real Madrid for Juventus this week after 9 successful seasons at the club, winning 15 major trophies including 4 UEFA Champions League titles - 3 of which have come in the last 3 seasons.
The Chelsea and Belgium forward has said that he is happy at Chelsea however - but suggested it would be a "dream" to play for Real Madrid.More news: US ramps up trade row with China, threatens new tariffs
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The 27-year-old joined the FA Cup holders six years ago and has won every domestic honour available as well as the Europa League.
Eden Hazard really is a blessed footballer!
These rumours certainly seem to be gathering momentum with each passing day.
'It's a very easy question for me, he is one of the most complete footballers in the modern game now, ' Martinez added.