Spurs and Bale are having a fantastic season, currently on fourth place - just a point below third placed Chelsea. But the Welsh Wizard is being linked with a move to Real Madrid in the summer.
The 23-year old winger is being compared to Real superstar Cristiano Ronaldo and failing to secure Champions League football would see him leave White Hart Lane at the end of the season.
"Gareth's future is intimately related to what the objectives that we achieve for the season. Hopefully qualifying for the Champions League means we can attract better players and continue to hold on to our best players," Spurs boss Villas-Boas said.
Bale has been playing upfront recently and is likely to continue his in his new role against Newcastle on Saturday after missing Jermain Defoe through injury and Emmanuel Adebayor away on international duty with Togo at the Africa Cup of Nations.
Tottenham and Real Madrid have already made a deal during the transfer of Luka Modric in August. The Croatian has also urged Bale to join him at the Santiago Bernabeu. Modric, 27, has had a tough season at Real, with the club itself already way behind league leaders Barcelona.
The Croatian playmaker has been linked with Chelsea and Manchester United during te summer.
Meanwhile, Spurs chairman Daniel Levy will hold a £60million valuation for Bale. Real, however, believe that £50m is sufficient to tempt spurs to sell their star man.
Spurs fans wouldn't want their Welshman to quit but will certainly question the managers decision not to sign any striker during the January transfer window.
Tottenham had been in touch with Internacional to sign their striker Leandro Damiao but their £15million bid was rejected on deadline day. Spurs are left to rely on Clint Dempsey and Bale upfront.