Ginola has watched on in despair over the last few years as Spurs have been tempted to part with star players like Dimitar Berbatov and Luka Modric after receiving big-money offers. The Frenchman does not want to see the same happen with Bale this summer.
"They are going to have offers on the table, but if you want to keep being successful it is important that you keep your best assets and Gareth Bale is one of them," said Ginola, who played 127 times for Spurs.
"Spurs have made mistakes in the past like selling Berbatov, Modric and Rafael van der Vaart. Let's not do mistakes any more.
"Last summer they were minus two very important key players and they had to rebuild the midfield."