Spurs have been linked with interest in the Bordeaux winger, with reports in Brazil claiming the 20-year-old is attracted by the prospect of working for Pochettino over Arsene Wenger after positive discussions.
Bordeaux have maintained Malcom will not leave the club before the end of the season, with Spurs reportedly happy to comply as Arsenal withdrew from the race for his signature.
When asked whether Malcom was likely to be heading for Spurs, Pochettino told Sky Sports: "That is a rumour and I don't want to speak about it. I am happy with our squad.
"We are open to quality players but you know very well it is difficult in this transfer window."
Pochettino has previously spoken of agreeing deals in January for the summer rather than bolster his squad during the mid-season window.
He added to BBC Sport on Sunday: "It is not easy to add a player who can help for three months. It is very difficult. For some clubs it is easier but it is not easy for us."