Delivered to the Pope by French Prime Minister Jean Castex, “For Francis, with much love” is written on the jersey.
Aguero returned to training over the international break and on Wednesday, he featured in a training game against UE Cornella.
Aside from salary and bonuses, Ronaldo would earn from endorsements and partnerships with brands and his CR7 brand.
Several players had until Friday, 24 hours before they were due to play in LaLiga matches, to return to their clubs.
Pep Guardiola has announced his intention to leave Manchester City and explore opportunities at the international level when his contract expires.
Since joining Barcelona at the age of 10, Fati has scored 12 goals in 42 appearances across all competitions for the club.
Messi was set to sign a new deal with the club, but is now heading for new pastures – possibly Paris Saint-Germain (PSG).
At the press conference, 34-year-old Messi is expected to share his perspective of the departure that has stunned world football.
The Brazil international had claimed he was owed €43.6 million ($51.3 million) in unpaid bonuses by the Spanish La Liga giants.
Barcelona in a statement on their official website on Monday said Aguero will be joining the club on a free transfer on a two-year deal.
