The German, who has scored 16 goals in 29 appearances this term, added that he does not want to tie himself down when it comes to seeking new opportunities abroad.
"If you take Germany, it would be a lie to say that you would not like to play for Bayern [Munich]," Werner told Sport1. "It would be a lie to say in England you'd not like to play for Manchester United or Manchester City.
"Spain – Barca or Real. There are great clubs in every league. Italy or France would not be my leagues, but the other three.
"There are so many clubs you'd like to play for. I don't want to tie myself down."