Franck Ribery signed a contract extension until the summer of 2018. Like Robben's, his existing contract had been due to expire next summer.
Schalke want to show RB Leipzig "what honest and proper Bundesliga football is about" when the two in-form sides clash at Leipzig's Zentralstadion.
Ribery said he believed the summer change in coach had also been a pivotal factor but added that he had formed a close bond with Carlo Ancelotti.
Wolfsburg midfielder Luiz Gustavo has confirmed Inter Milan and Juventus made an approach for him in the summer.
Tuchel was strongly critical of his side's performance in the 2-1 loss, telling reporters they had been "deficient."
Borussia Dortmund have told Liverpool they should not waste their time pursuing a deal for U.S. international Christian Pulisic.