In the mean time, Bakayoko appears to be settling in to life in London well. Both Tweets have since been deleted.
The Premier League champions confirmed on Saturday that Bakayoko has joined the club after he successfully underwent a medical this week.
No financial details relating to the deal have been officially disclosed, although The Guardian report that Bakayoko's move is worth up to €45m (£39.4m). Matic is 28 and United would be willing to offer him a longer-term contract.
One player definitely heading for the Stamford Bridge exit is Nathan Chalobah.
"I am very happy to be here and to join this great team".
However, it turns out that he was giving false hope to Man Utd fans, with the Red Devils also linked with a swoop for the 22-year-old this summer.
And Bakayoko now looks set to finally become a Blues player this week after a fee was agreed between the two clubs.
After weeks of speculation about the transfer, news that the 22-year-old is Stamford Bridge-bound hardly comes as a surprise - especially not to numerous Manchester United supporters that saw the Mail's tweet about it on Thursday.
Matic's future at Stamford Bridge has been in serious doubt over the past few weeks and the Serbian global edged closer to the exit door after Chelsea agreed a deal to sign Monaco midfielder Tiemoue Bakayoko.
The Frenchman is due to have his medical on Friday, and the Premier League champions will pay £40million plus add-ons for the 22-year-old.