The Germany international joined on a €3.5m loan last summer, and the Bianconeri have the option to make it permanent for €13m.
“Returning to Schalke? I can't rule that out," Howedes told Bild.
“It probably won't just be my decision, but if I were to play at the Veltins Arena again it would be emotional, because it's my home.
“I'm happy in Turin, we'll define my situation in the next few weeks.
“I would have no problem working with [Domenico] Tedesco, we spoke in a frank way and I never had any conflict with him."