Former F1 world champion Jenson Button thinks his former teammate, Fernando Alonso, will only return to the sport if he has secured a place in one of the top three constructors.
Sebastian Vettel sparked a merry-go-round when he announced he would leave Ferrari at the end of the season.
The prancing horse moved quickly to hire McLaren's Carlos Sainz and, in turn, won over Daniel Ricciardo of Renault.
It has been suggested that Alonso, 38, who retired from F1 in 2018, could step into Renault's vacant seat.
Button believes that the two-time world champion will only return if he is approached by Mercedes, Ferrari or Red Bull.
Sky Sports asked the Brit if his former teammate would return next year and he replied, "No, it is my short answer.
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"If he was pushed, it's crazy for me. Four-time world champion.
"I think he showed his speed last year. He had a difficult time in the season when Charles was doing really well and I think it hurt him a little bit mentally. But he came back really strong and is just someone you would definitely choose to put in your car if you had an F1 team.
"There must be more than that. I don't know if Ferrari is in the way of not wanting two number one drivers or what, but it is a really strange choice for me and I am still shocked that Sebastian [will not be] in a red car ".