“Celtic made a genuine offer for Papy, but it presented two concerns,” the 26-year-old’s advisor, Mouhamed Gueye, told The Scottish Sun.
“It was firstly bound up with the sale of their central defender Van Dijk. Secondly, their offer was less interesting financially.”
Virgil van Dijk joined the Saints from Scottish Premiership champions Celtic on a five-year contract in the summer transfer window.
As a direct replacement for the Dutchman, Celtic recruited Jozo Simunovic from Dinamo Zagreb on transfer deadline day. The 21-year-old is a Croatia Under-21 international and is highly rated and talented.
Celtic will return to Scottish Premiership action on Saturday afternoon when they take on Aberdeen away from home at the Pittodrie Stadium.