The Welsh star's representative also claims the player has been priced out of a move to Barcelona who will instead sign the considerably cheaper Jordi Alba from Valencia
Chelsea's victory over Bayern Munich in the final of the competition, ensured Spurs will not be playing in Europe's premier competition next season, despite finishing fourth in the Premier League, something the player's agent suggests will be an issue for the 22-year-old.
"Yes, it is clear that this is a problem," said Barnett when speaking to Sport, a Catalan-based newspaper.
And whilst Barcelona have their sights set on improving their left side, they look set to sign Valencia’s Jordi Alba as the club cannot afford the £40 million price tag that has been placed on Bale.
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"I think it's too expensive for the club," he admitted. "To my knowledge, [Barcelona] has not made any offer for him."
However Barnett suggests that a deal could be struck if the Catalan club and Tottenham are willing to negotiate.
He continued: "If interested, they would have to put money on the table and then start talking. But it seems that the club is working on the signing of Jordi Alba, a cheaper option.
"The big European clubs already know how much it would take to do the operation and therefore if you are interested you know what kind of offer has to put on the table."