Head of Audi Motorsport Wolfgang Ullrich says a quick decision will be taken regarding Heinz-Harald Frentzen's future after the former F1 racer slammed his employers following the DTM finale at Hockenheim.

Frentzen, who had secured a surprise pole position at the wheel of his Audi Sport Team Abt Sportsline A4, suffered a disappointing race as he lost the lead at the start and then suffered problems in the pits to be running in the lower reaches of the point scoring positions in the closing stages.

As if that wasn't bad enough, contact with fellow Audi driver Mattias Ekstrom just three laps from the finish saw Frentzen forced to retire - before he launched a scathing attack on the team, saying he hadn't been treated fairly or fully accepted into the Audi squad following his move from Opel during the off-season.

However, while he admitted his driver was understandably upset with the way the race had developed, Ullrich said Frentzen's actions weren't acceptable and he had been treated no differently to any one of the Audi drivers on the grid.

"I can understand that Heinz-Harald Frentzen is deeply disappointed after the race at Hockenheim," he said. "He started from the pole position and was hoping to claim his first victory in the DTM. But the race did not go for him as expected. He was overtaken by Bruno Spengler, gave away valuable time when driving off from his second pit stop and was spun by a team-mate shortly before crossing the finish line. It is understandable that he is less than delighted about this.

"[However] Making mutual accusations in public, such as those voiced by Heinz-Harald on television, is not Audi's style. We assume that Heinz-Harald made his comments as an initial response to the disappointment he suffered and will see things differently with a certain detachment. Everyone at Audi Sport and Audi Sport Team Abt Sportsline has been fully committed to enabling Heinz-Harald to achieve good results. He had the same material as his team-mates and the full support of the entire Audi squad in a season that was difficult for all of us.

"We are now going to take a quick decision as to whether or not there will be a joint future for Heinz-Harald Frentzen and Audi. I'm disappointed by him."