After splitting from Emilio Alzamora, Marc Marquez and younger brother Alex will now be managed by Jaime Martínez Recasens.
Martínez, 34, takes on the role having been head of motorsport marketing for Red Bull for the past 12 years, based in Madrid.
“We are very happy to announce that Jaime will join our team starting from the Misano GP,” read a statement from the Marquez brothers.
“After his experience at Red Bull he knows perfectly the world of motorsport and sport in general and offers a new strategic vision that we believe will bring us a lot.
“Our goal on the track will continue to be to get the best results, we are sure that we will form a great team.”
Alzamora had overseen Marc Marquez’s career since the age of 12.
The eight-time world champion, currently recovering from his latest right arm operation, returned to a motorcycle at Aragon on Wednesday – increasing speculation that he will ride at next week’s Misano MotoGP test.