Celtic assitant manager Johan Mjallby has admitted his club have an interest in Maritimo striker Baba Diawara.
The Senegal international is currently the top scorer in the Portuguese top flight with nine goals.
"He's been on the radar for a long time. We've seen him in the past," said Mjallby as his side left for Italy on Europa League business.
"We always look for players to strengthen the side, but it's too early to say if it's going to happen."
This week, the Madeira side's president was reported as saying that they had opened talks with Celtic over the sale of their £3m-rated frontman.
The 23-year-old Senegalese has played with Maritimo for four years, and his displays have attracted the attention of several clubs across Europe.
The player has also represented his country once at senior level.