Ross Brawn has said that his former number one driver, Jenson Button is 'courageous' for inking a deal that will see him switch to McLaren next year and go directly head-to-head with Lewis Hamilton.

Brawn was keen to hang on to 2009 F1 World Champion Button, but in the end the now Mercedes-owned outfit failed to reach an agreement and the Englishman opted to sign a multi-year deal with McLaren.

Speaking to Auto Motor und Sport recently, Brawn reiterated that the sticking point wasn't money.

"His decision is a disappointment because we worked well together. But whatever is reported, it was not about money," Ross explained. "In the end our offer was even more attractive than McLaren's.

"However it would not have made sense to employ a driver who was not happy and who sees a bigger challenge elsewhere. Further negotiations would have been pointless.

"Jenson obviously wanted to drive the same car as Lewis. That is courageous and I have to respect it."

Mercedes Grand Prix - formerly 2009 F1 Constructors' Champions, Brawn GP - have since confirmed former Williams F1 ace Nico Rosberg and while his team-mate has yet to be announced, Ross is confident they will get the best driver possible.

"We won't make a hasty decision," he continued. "That would not make sense. Our cockpit is the most attractive [left] on the market now. Everyone will wait and see what happens."

Meanwhile, asked if the fight with Red Bull in 2009 had compromised them in anyway for next year, Brawn said the battle didn't have a significant impact on their preparations for 2010.

"We sacrificed only an additional week in the wind tunnel for the 2009 car," he continued. "Already in the middle of the 2009 season we started to concentrate more on our car for 2010. We are a small team and our resources are limited. We had to start looking at 2010. Naturally the temptation was to focus on the fight with Red Bull. But we held our nerve.

"[Now following the deal with Mercedes] I can focus more on the development of the car and the team instead of looking for backers to keep the squad alive.

"Mercedes selected us because we work efficiently. I learned as a Mercedes customer that they have similar principles and we are therefore a marvellous fit. We want to profit from areas in which Mercedes are good - for example, quality control.

"We offer a team that is already very efficient. Our opponents [in contrast] will have to spend time and energy cutting their staff levels in 2010, whilst we can concentrate fully on the development of our new car."