Brawn stepped back from F1 at the end of last season, having led the Mercedes team to the cusp of its current dominance.
Before that, he was team boss at Honda, and after the Japanese carmaker withdrew he took over the Brackley outfit and won the 2009 title as 'Brawn GP'.
The burly Briton is, however, perhaps best known for being technical director at Ferrari during the ultra-successful Michael Schumacher era until 2006.
Speculation he might abandon retirement with a new prominent role at Maranello surfaced in May, when he was spotted at Ferrari's headquarters.
But he insisted he was only there "with a group of friends as part of a tour of Italy -- no more than that!"