"Seeing Lewis cross the line in Germany and take his 91st victory was a very special moment," said Toto.
"Valtteri's race, however, could not have gone much worse, going from pole position to a DNF and a significant points loss for him in the Drivers' Championship.
"It was undoubtedly a tough blow at this stage of the season. We have identified a failed electrical component in the Control Electronics as the cause of the problem and the evidence suggests that swift action in retiring the car prevented mechanical damage to his Power Unit.
"A DNF is always tough for a driver, but one of Valtteri's biggest strengths is his resilience and his ability to bounce back, so I'm sure he'll be eager to hit the track in Portugal.