Three-time World Champion Sir Jackie Stewart has warned Ferrari that a Kimi Raikkonen and Fernando Alonso line-up could have a negative effect on the team.
The Scuderia are expected to have a dream partnership next year as Raikkonen is on the verge of rejoining the team as a replacement for Felipe Massa, who confirmed on Tuesday that he won't drive the squad next year.
However, Stewart believes the return of the Finn could upset double World Champion Alonso, who has been the clear number one at the team since he joined in 2010.
"I think there would be destabilising elements to it," Stewart told BBC Sport. "If Kimi went to Ferrari, would Alonso deliver as well as he has based on him being the chosen son, so to speak?
"It would be a very confusing element within that team for them to have Kimi and Alonso, who I doubt would really like to have Kimi there."
Alonso has inisted in recent days that he has "no preference" and "it's a team decision, but he also added that "he would be happy" if Ferrari kept Massa on for another season.
Asked if Alonso could move on upon Raikkonen's arrival, Stewart said: "It [leaving] would be the best choice for Alonso if he didn't want to race [for Ferrari] because he felt they were trying to push someone in who he did not want. In an emotional breakdown, sometimes you can go off and try to do something but who is there to go to?.
"I don't think there is an offer at McLaren, although it would be good for that team, but I don't know if they have the money for it.
"I don't think Red Bull are going to change their commitment to Daniel Ricciardo, but they have chosen him without any thought that they could have Alonso.
"There would be another destabilising element if Alonso threw the toys out of the pram and tried to go with Red Bull.
"How would Sebastian Vettel feel about that? It would be a much greater threat to his unquestionably privileged position at Red Bull and would Red Bull want to disturb any of that? I doubt it."