The Brazil international has challenged the under-performing Bundesliga outfit to address its decline by making major moves in the transfer market.
Wolfsburg midfielder Luiz Gustavo has challenged the club to bring in more star names or risk losing him.
The Bundesliga outfit appeared on course for its first Champions League semifinal after a 2-0 first-leg victory over Real Madrid last month, but crashed out of the competition after going down 3-0 at the Bernabeau in the return.
The Brazil international has challenged the club to keep its word of consistent investment in the squad, suggesting failure to do so could tempt him to seek an exit this summer.