After spending the second half of last season on loan at Celtic, Jeremy Toljan is reportedly on the move again.
According to Bild, Toljan missed Dortmund training on Tuesday to undergo a medical at Sassuolo ahead of a one-year loan.
The Serie A club will also have the option to buy the 24-year-old for €8m.
Dortmund purchased Toljan from Hoffenheim two years ago for €7m but the fullback failed to impress. With the addition of Real Madrid loanee Achraf Hakimi last summer, he was never close to threatening the first team last season.
The German giants have since added Nico Schulz and Mateo Morey, pushing Toljan further down the pecking order.