The Serbian joined the Portuguese giants on a temporary deal earlier this week, despite Liverpool 's previous stance they would only consider a permanent exit for the 24-year-old.
“Marko had a very regular and consistent year on loan at Hertha Berlin and was at this early stage with us in which he played two official games," Matos told O Jogo.
“He played in both as a No.6 and, despite not being his most natural position, he performed very well.
“He's a midfielder who feels comfortable in a more positional game, but at the same time has a wide range of space.
“He has a good tactical culture and that allows him to be versatile in the functions of means in different structures.
“He's aggressive in tackling and has a natural ability to guide the ball through the interior.
“He was one of Serbia's greatest talents when he was signed. He never got room at Liverpool, due to the options for the positions, and at the same time the market opportunities that arose and allowed him more playing time."