The 48-year-old insists rumors of a bid for the Barcelona star are ill-founded and says his side is only interested in bolstering its midfield options.
The French champions have long been linked to a potential world-record bid for the Argentina ace, with some reports suggesting a fee of more than 250 million euros could be offered to land the Barcelona star.
Blanc, however, has dismissed the rumors, stressing that Les Parisiens are only looking to bolster their midfield at present, as talk of a move for Juventus star Paul Pogba continues to surface.
"Talk about it with transfer window specialists. Messi is in Barcelona," Blanc told reporters when asked over possible interest in Messi. "I have already spoken of the transfer window. If there is a big signing, it will be in midfield. Nothing else."
PSG has been rumored to be preparing a potential swap deal involving Marco Verratti in order to land Pogba, while Chelsea's Juan Mata and Eden Hazard have also been linked with the big-spending Ligue 1 leaders.