Double DTM champion Rast replaced sacked driver Daniel Abt for the Tempelhof Airport rounds earlier this month, achieving a third and fourth-place in the final double-header.
Audi’s impending exit from the DTM could leave Rast without a flagship drive next year, although he is widely expected to retain the FE seat next season.
Audi FE ever-present Di Grassi reckons Rast would be “a great addition to the team” based on the two drivers’ similar feedback.
He told Motorsport.com: “[Rast] was struggling in the first two races [10th and 13th] but in the last two, which was less energy demanding, he did a very good job.
“He was always quick, so it’s good to have his input in the car.
“His feedback was very similar to mine so we got along very well. What he wanted from the car is very similar to what I’ve been asking Audi for a long time now, so it just confirms the direction I’ve been pushing.
“Rene also thinks it’s the same direction, so that’s also very good because it does not create any conflict.
“I will be more than happy to have him as a teammate for next season if that’s Audi’s choice, I don’t know exactly how everything is going to go.
“I have no information of how Audi is going to do it for next season so it’s just that if Rene is in the…