The former Arsenal midfielder joined the Blaugrana in the summer of 2012 but has struggled to get regular football at Camp Nou and his fellow Cameroonian believes that he deserves to showcase his talents elsewhere.
"Song has to leave Barca," Eto'o told beIN Sports. "At his age, he must play and he could be in the starting XI at any big club."
The veteran forward has been in fine scoring form of late for the Blues but was withdrawn during Saturday's 6-0 hammering of Arsenal with a hamstring injury and is concerned that he may miss his side's Champions League quarter-final trip to Paris Saint-Germain, for whom he once nearly signed.
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"I could have played for PSG when Luis Fernandez was the coach. He bought me dinner but the clubs didn’t find an agreement.
Asked if he could yet join the Ligue 1 champions, Eto'o replied: "As a fan, maybe, but not as a player.
"Leonardo has talked to me about coming to Paris but it did not happen and it's a shame because I would have liked to play for PSG."
Chelsea manager Jose Mourinho was overheard in February joking about Eto'o's age, something which the in-form striker has since mocked with some creative goal celebrations, and the 33-year-old insists that there is no problem between him and his boss.
"My 'problem with Mourinho'? Don't talk about it," he continued.
"I score goals. I have not stopped doing it but I cannot do that if I stay on the sidelines. Even though I am old, I still know how to score. The 'old man' celebration against Tottenham had nothing to do with Mourinho."
"This is a difficult question," Eto'o said when asked what makes the Portuguese different to his previous managers. "There is something in his approach to a match that the others don't have but I cannot say because we want to win the Champions League."