The official website of the Portuguese national team released on Saturday a message of support from Ronaldo to Ferreira, whose club Boavista is currently in the eighth position of the first division of Portuguese league standings, reports Efe.
Ronaldo encouraged the 19-year-old player to have "a lot of strength" in his fight against the disease.
Ferreira's disease has dominated the sports scene in Portugal, as Porto-based Boavista has opened a bank account in order to support the striker financially.
Ferreira had recently joined Boavista to start his first season as a professional soccer player, but his career will stop until he recovers.
Boavista management announced its unconditional support for the striker, who has a contract with the club until 2018.