Rosberg, the 2016 world champion, said almost everybody wishes for more success in formula one for the two-time world champion.
"We all want to see that, but nobody wants him because of his political games within the team," the German is quoted by Sky Italia.
Rosberg said he is not sure how Alonso can stay motivated to remain in F1 with McLaren.
"I don't know how he does it, I really don't. He knows he's one of the best, but he cannot qualify 14th. It's incredible," the former Mercedes driver said.