Some newspapers have reported that the 21-year-old midfielder hadopened negotiations over a new deal, having only signed a long-term contract extension one year ago.
Speaking ahead of Tuesday's Carabao Cup clash with Barnsley at Wembley, Pochettino dismissed the reports as just "rumours".
He added: "Like always I tell you, when something happens or if a decision happens the club will communicate but that is a rumour."
It has also been reported that 'super-agents' Jorge Mendes and Mino Raiola were looking to make Alli their latest big-name client.
The Spurs boss was asked if Alli had approached him for advice on his representation.
Pochettino said: "He didn't ask about that and it's his business. Of course, every single player can ask me and can knock my door.
"I am open to giving advice but he didn't ask me and I cannot say more."