The Belgian playmaker finds himself second choice at the Estadio do Dragao and admits he is ready to reconsider his future at the club.
Defour joined Porto in 2011 from Standard Liege but has only made 33 appearances for the Portuguese top flight side, 25 of which coming from the bench, in two-and-a-half years.
Ahead of the 25-year-old's departure from Standard Liege, there was speculation linking him with a move to Aston Villa and Defour admits playing in the Premier League is a long-term ambition.
"I still dream of the Premier League, but I don't know if it's realistic for someone who isn't even a first-team regular at Porto," he told Het Laatste Nieuws.
"I think the Bundesliga would fit me better. I haven't decided my future yet.
"I will be thinking about my options in the upcoming weeks."