Fernando Alonso's return to Formula 1 can be compared with the comeback of another F1 legend, according to 2016 world champion Nico Rosberg.
"My return has been more difficult than I expected," Speed Week quotes Spaniard Alonso, a former Schumacher rival and two-time champion, as saying.
"At first I thought four race weekends should be enough, but now I think it will take eight or nine."
Rosberg says 39-year-old Alonso's 2021 Alpine car is one reason why he is struggling so far as he re-adjusts to Formula 1 after a two-year sabbatical.
"The Alpine is not an easy car to control, and Alonso seems to have a particularly hard time with it," said the German.
"Now and then we see those flashes of Alonso genius and it reminds me a little of Michael, when I was his teammate at Mercedes in his comeback.
"It has something to do with age," Rosberg insisted. "Fernando has not been in Formula 1 for two years and it will be a while before he is completely the same again."