The midfielder's decision to leave his long-time representative Rob Segal will alert a number of big teams who are interested in prising him away from White Hart Lane next summer.
Mauricio Pochettino will not be letting his prized asset go in the current market, but it is understood that Alli is keen on a move abroad at some point in his career.
Alli signed a new six-year Spurs deal last September worth £60,000 a week, but is aware that he could be making more than triple that figure elsewhere.
Both Manchester clubs, Chelsea and a host of European heavyweights are reportedly interested in securing the 21-year-old's services.
Tottenham's are known for their rigid wage structure, with only Harry Kane and Hugo Lloris earning £100,000 a week.
Other clubs will not hold back and could be be prepared to offer more than £200,000 per week for Alli's signature.