The Brazilian international has been linked with a January move to the Old Lady.
“I’m happy to know that there are some big teams tracking me and that they like the way I play,” Diego told Sky Sports.
“However, I have a contract until 2011. I’m not thinking about renewing at the moment, but I also haven’t thought about leaving.
“Werder haven’t proposed a contract renewal so far and I have had offers from other teams, but that’s not to decide now.
“I don’t know whether I will play in Italy. There are teams I like there and I’m very interested in Serie A, but we will have to wait and see.
“Juventus are a great team and anyone would like to play for them, but I have to respect the side I play for.
“There is no agreement with the Bianconeri yet – I haven’t signed anything.”