The Wales international has been heavily linked with a switch to Real Madrid following his prolific season in North London, while Ligue 1 outfit Paris Saint-Germain have also been touted as a future destination.
"I think that if PSG is aware that the player is on the market, I won't be surprised that they do everything in their power to sign him," Comolli told Telefoot, according to London 24.
"But today, there is a 90% chance that he will stay at Spurs. I know the president (chairman) of Spurs and how he works. Only three or four clubs can afford [Bale] right now."
The 23-year-old put pen to paper on a new long-term contract at Spurs last summer.