Australian rider Jack Miller will exit the MotoGP stage at the end of the season after his team Pramac Yamaha announced on Thursday that they would not be extending his contract.
The Tuscany-based team later confirmed that his seat will be taken by Pramac's Moto2 rider Izan Guevara.
The 31-year-old Miller is 19th in the standings this season having picked up 23 points with a best finish of eighth in Hungary.
In his MotoGP career he has won four races, claimed 23 podiums and two pole positions.
"I still believe I have more to offer and more to achieve, and I'll take that motivation with me into whatever comes next," said Miller who appears set to join the Yamaha Superbike team.
"I'm looking forward to the next chapter of my career and seeing where that journey will lead.
"But before then, there are still races left this season, and my full focus remains on finishing the year strongly with the team."
The first of those races comes this weekend in Aragon where he will again look to put Pramac, who he joined in 2025 from Ducati, at the front of the grid.
"Beyond his contribution on track, Jack brought tremendous energy to our team," said Yamaha MD Paolo Pavesio.
"His positive attitude, spirit and ability to build strong relationships in the garage made him a pleasure to work with."
Pramac are now looking to the 22-year-old Spaniard Guevara, who won the Moto3 world title in 2022, to step up from Moto2 and partner Toprak Razgatlioglu.
"We have known Izan's talent for many years," said Pavesio.
"The speed he demonstrated on his way to becoming Moto3 world champion left no doubt about his potential.
"His work ethic, determination, consistency, and ability to continuously improve have confirmed that he is ready to take the next step.
"It is exciting for Yamaha to welcome such a talented young rider into our MotoGP project."