Tottenham have secured a four-year shirt sponsorship deal worth £34million with internet casino group Mansion.
The new contract becomes effective on 1 July - when the current agreement with holiday firm Thomson expires.
Manchester United had been linked with Mansion until a tie-up fell through but Spurs have capitalised with a deal said to be in the world's top 10.
Spurs have also changed their shirt manufacturers, with Puma taking over from Kappa.
Spurs chairman Daniel Levy said: "Tottenham has made progress both on and off the pitch in recent years.
"It has put the club in a good position to improve its commercial partnerships and the new agreement marks a significant uplift."
Mansion chief operating officer David Kinsman added: "Spurs have enjoyed an excellent season, with European football to look forward to next year."