Valeri Bojinov's agent has confirmed the Parma striker is in talks over a loan move to Sporting.
The Portuguese giants have made a move for the 25-year-old striker after he spent most of last season on the bench at Parma.
The Bulgaria international has attracted interest from several Europeans clubs this summer but it is believed Parma are only prepared to let him leave on loan rather than making a permanent transfer.
And although Sporting are leading the race for the former Lecce and Fiorentina forward, his agent insisted it is not yet a done deal.
"I can confirm Sporting are one of the sides who are very interested in Bojinov and are in negotiations for a possible transfer," Gennaro Palomba told A Bola newspaper.
"However, I am not yet certain he will go to Sporting, because there are other teams who are interested.
"It's true that Malaga are tracking Bojinov, but also other top level European clubs.
"Sporting's interest has been noted for quite some time."
Bojinov returned to Italy on a permanent basis last summer after Manchester City loaned him to Parma for the 2009/10 season, during which he scored eight goals from 30 league appearances, although only 15 were starts.
But Bojinov saw even less action this term, starting just 13 of his 31 games and scoring three goals.
He would face even more competition at the Stadio Ennio Tardini next season too, with Parma having already boosted their squad with the likes of Fabio Borini, Graziano Pelle and Nicola Sansone this summer.