Alonso has recently been linked with a return to McLaren although the indications out of the Woking-based team are that, for next season at least, Jenson Button and Sergio Perez would remain.
Whitmarsh has reiterated that intention during this week's Singapore grand prix, while Button told Press Association Sport he "had a good feeling" he would stay.
Despite that Whitmarsh has kept open the option of Alonso one day making a return to the team he left after just one season in 2007.
"I think most teams up and down this pit lane would happily sign Fernando Alonso. He's a very talented driver," Whitmarsh told Sky Sports F1.
"I expect next year our driver line-up to stay the same, but we are open to anything and in the longer term he would be a great asset.
"I think Fernando is in control of his own destiny, but we will see.
"Let's be frank, people want to sign Fernando Alonso because he is one of the best racing drivers in the world at the moment. He's an asset to any team."
Whitmarsh suggested the arrival of Raikkonen, who will leave Lotus at the end of this season, could have a disrupting effect on Alonso.
"I think people were surprised with the recruitment of Kimi. Not because Kimi is not massively talented or that they're surprised that Kimi would want to go to Ferrari," he said.
"One can see that is an exciting line-up, whether it is a sustainable driver line-up I don't know."
Button hinted on Thursday that he was set to sign a new deal with McLaren, when asked by Press Association Sport about his future.
"I've a good feeling I'll be here next year, which is as much as I can say," he said.
"I'm very happy that I'll be in this team next year."
As for 2015, when McLaren switch to Honda engines after a lengthy partnership with Mercedes, Button added: "I don't know about that yet.
"I can't really comment anyway - but I have a good feeling about that as well. The big H (Honda) is very interesting for the future.
"For the team it's fantastic for the future, and for any driver that is within this team in the future, it's a great opportunity to work with such a big manufacturer."
Asked whether the Lotus seat was of interest given Raikkonen is to vacate it at the end of this season and join Ferrari, Button joked: "It almost was earlier. I walked out of the toilet and straight into Lotus. Luckily enough there wasn't a snapper ready and waiting. That would have been a good story."
From Perez's perspective, the Mexican has also stated his contract is virtually a done deal.
"We've been having some discussions about the contract," said Perez.
"The contract is done, but we are just finalising the final dots.
"Obviously I cannot give too many details about that, but everything is pretty much done."