Real smashed the transfer record to sign Bale in 2013 and he has helped them win four Champions League titles.
The last of them came against Liverpool in May when he came off the bench and scored twice – including a stunning overhead kick – in a 3-1 win.
After the game Bale admitted he could now leave the club after being frustrated with a lack of regular minutes as a starter at the Bernabeu.
It’s the first time Bale has publicly put doubt on his future and Sheth thinks that’s a telling sign.
“I don’t know if he will stay. It’s very out of character for Gareth Bale to come out after a massive game like the Champions League final to talk about his future,” Sheth told the Transfer Talk podcast.
“We should have been talking about his overhead kick against Liverpool, one of the greatest goals in Champions League history, and we’re actually talking about whether he’s staying at Real Madrid or not.
“Every year Bale has been at Real Madrid, there’s always been rumours about him leaving. Every time he’s said ‘I’m happy, I’m staying at Real Madrid’.
“This is the first time him and his agent have questioned his future. That says something to me.”