Felipe Massa says that former Ferrari team-mate needs to 'relax' if he is to remain with the squad into the 2016 squad.
Ferrari has yet to pick up the option on Raikkonen's contract and has repeatedly emphasised that the Finn's future is in his own hands, with matters not aided by his crash at the Austrian Grand Prix.
Williams' Massa, who partnered Raikkonen between 2007 and 2009 before being replaced by the Finn when he returned for 2014, says Raikkonen needs to relax and show his talent.
"It's not nice to be in that position," Massa said of Raikkonen's current situation. "He's suffering more with the pressure than other things. Everybody says he is the 'iceman', but he's not really like that, he can suffer as well and it shows with some results.
"He just needs to relax and try to do his best, because he is definitely a big talent and he can do a lot better than what he is doing: everybody knows that."
Massa's current team-mate Valtteri Bottas has been linked with a move to Ferrari and Massa says that his young counterpart has the ability to thrive at a top squad.
"I think he's maybe one of the most important names on the market," said Massa. "We cannot forget that he has an option to stay [at Williams], so we need to understand what's going to happen.
"He's shown that he's a good driver, and has talent to drive in a top team. This is why other teams are interested to get him, but I don't know if he's going or not."