The 26-year-old's agent has revealed that talks are in progress between the two clubs.
"You'd have to ask his club about the status of talks," Flavio Perchman told Calciomercato.
"Porto are negotiating with Inter. Are we confident? I don't know, you'd have to ask Porto."
Pereira, who joined Porto from CFR Cluj in 2009, won the Portuguese Primeira Liga in 2011 and 2012 and the Europa League in 2011.