Ronaldinho, the three-time Ballon d’Or winner, met with Mamata Banerjee, West Bengal’s Chief Minister, and also gifted her a jersey.
Not since Brazil lost the 1998 final to France has the defending champion come close to retaining the FIFA World Cup title.
The ex-Barcelona and Paris St Germain player was in Belo Horizonte, where he played for local side Atletico Mineiro, when he got his diagnosis.
Brazil playmaker Kaka has been overlooked for the Copa America while striker Fred earned another shot at the tournament when he was named in coach Mano Menezes's squad on Thursday.
Over 40,000 Flamengo fans packed the Enganhao stadium on Wednesday to greet Ronaldinho on his debut for the club with a mosaic that said "Welcome R10."
Ronaldinho was given a welcome even bigger than Brazil great Zico when he was officially unveiled as Flamengo's new signing to a samba beat on Wednesday.