Rumor, there is no certainty in it. After Ronaldo officially parted ways with Manchester United, no one has made an official bid on Ronaldo. The news circulating in print and electronic media is just a figment of the imagination, journalists continue to fry news about Ronaldo to attract reading interest from published news.
Ronaldo who still has big ambitions to appear in the Champions League, will choose a club that can make his dream come true. Chelsea is a good club and is still active in the Champions League, but with the current conditions it is very difficult for Chelsea to win the Champions League.
Having Ronaldo in a team that is playing in the Champions League is something I really like. I honestly don't want to lose Ronaldo early in the top leagues right now, I don't want to see him in MLS or any team not competing in Europe. So maybe it will be good to see him at Chelsea if an offer comes in for him.
Chelsea would be better off with Ronaldo but even if that were to happen I believe his contract would not be for long. Chelsea need a quality striker where he can score more goals, and Ronaldo may still be able to take on the role of an experienced striker.