Flamengo are in talks to sign Porto's Colombia international midfielder Juan Quintero, according to media reports.
But the Rio de Janeiro club faces competition for the 22-year-old's signature from their Brazilian rivals Atletico Mineiro, Xinhua quoted newspaper Globoesporte as saying on Friday.
According to the report, both clubs are hoping to strike a deal with Porto before the close of Brazil's transfer window on July 21.
Quintero has scored six goals and created 15 assists in 62 matches for Porto, whom he joined from Italy's Pescara for five million euros in 2013.
A member of Colombia's 2014 World Cup squad, Quintero missed this year's Copa America in Chile due to a knee injury.