Standard Sport understands that Spurs remained locked in talks with Real Madrid regarding a deal for Bale on Wednesday morning.
“Gareth is closer to leaving Madrid than at any time in last seven years,” Barnett told BBC Sport.
“We are still negotiating. We shall see how it goes.”
Any move is dependent on Real agreeing to subsidise at least half of Bale’s reported £600,000-a-week wages.
A loan deal is looking most likely, although Real have pushed for a permanent transfer as they look to offload their highest earner, who has two years remaining on his contract.
Mourinho told reporters on Wednesday: “Gareth Bale is a Real Madrid player. I don’t comment on players from other clubs.
“It’s not my job to have contact with agents, I don’t want to comment on that, especially on players at other clubs.”