The manager told reporters: "He has to be aggressive in the right moment. When I have to say something about him that I have to criticise, that is it, he has to control himself in every moment.
"He can improve in that and maybe I can help him. I think Marcos fits into the profile as a left central defender or a left wing-back."
Rojo received 21 yellow cards and was sent off four times in his 49 appearances for the Portuguese side.