The Bulgarian striker scored 23 goals for Spurs in his first season for the club last term.
Berbatov was on a £24,000 a week deal when he first joined Spurs from Bayer Leverkusen in July 2006. The Sun says that Spurs have now bumped up his salary by another £6,000.
Tottenham is keen to avoid selling their star striker to reigning Premiership champions Manchester United.
