Red Bull faces a real challenge to retain four-time Formula 1 champion Max Verstappen, according to former driver and Sky Sports analyst Martin Brundle. <br>Verstappen has been honest about his dissatisfaction with the new era of regulations, initially describing them as "Formula E on steroids". While the Dutchman is under contract with Red Bull until the end of 2028, he has revealed that he is ...<a class='more' href='https://www.motorsport.com/f1/news/martin-brundle-warns-red-bull-faces-max-verstappen-retention-challenge/10816032/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-F1&utm_term=News&utm_content=www'>Keep reading</a>