The report states that Porto have been monitoring Pedro Franco in recent months and that they are readying an official bid for the Colombian international.
Porto are expected to offer Daniel Opare – who is on loan at Besiktas from Porto – in a part-exchange deal for Pedro Franco.
The Colombian international lost his place in the starting line-up following a dispute with Slaven Bilic and could now be on his way out of the club.
Besiktas linked with Aston Villa defender Ron Vlaar
Franco joined besiktas in July 2013 for €1.5 from the Colombian club Millonarios FC. The 24-year-old has made a total of 37 appearances for Besiktas in all competitions this season.
The Black Eagles finished the league in third place and will play in the Europa League group stages next season.