Hamilton continues to set Formula One alight, winning the F1 Drivers’ Championship for a fourth time at the tail end of last month.
The 32-year-old is a record breaker and many expect him to sign a new Mercedes contract despite ongoing talk that he could jump ship to Ferrari.
But Rosberg, who often clashed with the Brit during their time in motorsport together, thinks Lewis Hamilton may retire soon.
“He has hinted this year that he doesn’t want to spend so much time travelling,” the German told news agency DPA.
“He wouldn’t do that if he wasn’t thinking of it at least a little.”
However, speaking recently, Hamilton said he was keen to sign a new Mercedes contract this month.
“It is quite an easy process for us,” Hamilton said.
“We already have something in place and it’s really just about extending it and enhancing it, working on what more I can do for them, for the sponsors, the brand and vice versa.
“But I’m pretty sure within the next month or so we will have had time to have sat down.
“Now all the pressure is off, we can go and enjoy these next couple of races.”
Hamilton also vowed to return to form after partying saw his form tail off at the end of last season.
“There is zero concern for me. It is clear that something happens when you win the championship, and in the week after I won the title in Mexico I partied a lot,” he said.
“That is what you do. I still drove relatively well, but I would not say I was at 100 per cent, as I was during the rest of the…