Bale was Spurs' standout performer in 2012/13, with his efforts earning him an enviable collection of individual honours.
He was, however, unable to help Tottenham to a top-four finish and a place in next season's UEFA Champions League.
It has been suggested that failure to secure a seat at European football's top table could spell trouble for Tottenham, with the likes of Real Madrid making no secret of their admiration for Bale.
Big-money bids are said to be in the pipeline, but Dembele is looking for Spurs to stand firm and ensure that key personnel are not allowed to slip through the net.
He told Sky Sports News HD: "He is an unbelievable player, so you never hope that your best player goes. That's my case as well.
"At the club we talk to each other a lot and he is a good guy."
Dembele believes that, with Bale on board, the 2013/14 campaign could be a productive one for both Tottenham and himself.
He added: "We are looking forward to starting the competition again because I think we can do big things.
"I always think I can do better. It was my first year (last season) and I hope next year I can do much better."