Messi was officially unveiled as a Paris Saint-Germain player on Wednesday, and also had his first press conference at his new home.
However, the joyous scenes witnessed in the French capital are understood to be the direct opposite reaction in Catalonia.
Players at the Camp Nou are believed to be "angry" about the latest developments at the club, while some fans have already shown their disgruntlement by booing defender Samuel Umtiti during the Joan Gamper Trophy match against Juventus on Sunday.
Reports suggest that the French defender even sat out Barcelona's trophy celebrations after he was jeered by his club's supporters every time he got on the ball in the pre-season encounter.
A source close to the LaLiga giants has now provided some discouraging details about the Blaugrana players' reaction to everything that has unfolded at the club in recent days.
"There are a lot of angry people, and they are angry for different reasons," the source said, according to The Athletic.
"Maybe some are right, maybe some are wrong. Every situation is different.
"Neto wants to go. [Philippe] Coutinho feels like s***. [Miralem] Pjanic feels defrauded. Jordi Alba is on a crazy long-term contract.
"Maybe it is the fault of the old management, who were throwing money everywhere, but this situation was always around since they [current president Joan Laporta and the new board] won the election [in March]."
It is understood that Barca are still struggling with the same financial issues they had while trying to sign Messi to a new deal, with their excessive wage bill being arguable the biggest problem.