The 28-year-old right-back has been on the sidelines since May after undergoing hip surgery in the summer.
"I feel good," he told Dortmund's official website. "There are days when you don't feel particularly great, but that's normal at this stage of the recovery process.
"I'll definitely be fit for the second half of the season. I want to return before then but, if I don't, I won't be too downhearted."
Piszczek has been at Dortmund since 2010.