Southampton are eyeing a £15m swoop for Japan forward Shoya Nakajima in the January transfer window.
According to Talk Sport, Southampton are prepared to make an offer for the striker in January as they look to bolster their attacking options.
Nakajima only joined Portimonense in the summer, after a loan spell with the club, but could already be on his way to the Premier League six months later.
The 24-year-old has scored four goals in seven league appearances this season, after scoring 10 in 29 last campaign.
Portimonense ply their trade in the top-flight of Portugal, where Nakajima is quickly building a fierce reputation.
Mark Hughes is keen to strengthen his choices up front and is looking for someone to play alongside top scorer Danny Ings.
Shane Long, Charlie Austin and Manolo Gabbiadini have struggled for form this season and Nakajima has been operating as a second striker for Portimonense.