Levy battled with Chelsea last summer to keep hold of star playmaker Luka Modric at the north London club and speculation is again rife that the Croatian, as well as winger Gareth Bale, will be the subject of strong interest again in the close season.
Last month, Wales international Bale talked of leaving Spurs if the club fails to match his ambitions, while Modric is a known target for a slew of European clubs.
Tottenham manager Harry Redknapp has said that the club will end up going backwards if they sell their top players and Levy agrees.
The Spurs chairman wrote in his end of season address to supporters: “Our squad has top players at all levels and we shall continue to seek stability and to retain key players this summer and beyond.
“We are a club that is focusing on growth and moving forward.”
Meanwhile, Qatari club Al Sadd have confirmed that they have secured the services of former Spain striker Raul from the start of next season.
The 34-year-old, who made his name at Real Madrid, announced last month that he would be leaving German side Schalke at the end of the campaign.