The 27-year-old entered F1 in 2011 as the series' reigning champion, and he is now returning to Mercedes, for whom he raced throughout his four-year DTM career.
And there are reports di Resta could combine his racing duties with a formula one role with Mercedes' works Brackley based team this season.
"It is emerging that Mercedes may ask di Resta to act as reserve driver for their F1 team, which will make him back-up to Lewis Hamilton and Nico Rosberg," the correspondent for the Times newspaper, Kevin Eason, said.
Di Resta will kick off his DTM return immediately, with a test beginning on Tuesday.
"It feels really good to be back in the DTM and to see so many familiar faces again," he said.