It was suggested in the British press at the weekend that the England international was in line for another new long-term deal, despite only agreeing fresh terms a year ago.
Pochettino is unaware of any such discussions taking place, though, while also denying claims that he gave Alli advice over which agent to hire as he reportedly prepares to split from his current representatives.
"Like always I tell you, when something happens or if a decision happens the club will communicate but that is a rumour," he told reporters.
"He didn't ask about [his representative] 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."
Alli, understood to be on £80,000 a week at Spurs, has two goals to his name from five Premier League outings this term.