The 27-year-old scored 38 goals in all competitions last season for Benfica.
“I want to play for a big club from a different league, but the one to decide will be Benfica,” the Paraguay international told RTP.
“The coach spoke to me yesterday and he told me he wants me to stay for one more year, but I do not know. That will depend on Benfica.”
Manchester City are among the clubs interested in Cardozo.