The Porsche driver says Rosberg's new family may have played a role in the decision
F1 driver Mark Webber says it's impressive Nico Rosberg's retired from the sport at the top of his game.
The German announced last week he'd called it a day at just 31 - five days after winning his first drivers' world championship with Mercedes.
"Absolutely," Webber said when asked whether Rosberg was in fact a worthy champion. "I was really happy for Nico, I thought he drove really well this year under immense pressure.
"It's been a long campaign for him, it hasn't just been 21 races. He's had over 80 races fighting for the championship against Lewis [Hamilton, Mercedes teammate]. Lewis has obviously got three and now Nico has that one that he's been fighting for for so long.
"I'm really happy for him. I think Mercedes will miss him because technically I think he brings a lot to the programme as well. He's very fast, good at setting the car up and using the resources within the team."
Webber says Rosberg's young family was a factor in his decision - and that it's not that strange he's retired.
"He's got a little family now and, you know, racing drivers don't have to drive forever. That's just a given. People think there's a shelf life and drivers just run that out. That's not always the case.
"It's a sniff early but in terms of him wanting to do it, I wish him all the best."