Rayo Vallecano striker Alberto Bueno is being tracked by Southampton.

Bueno struck four goals in 14 minutes in victory over Levante on the weekend.

The Mirror says the 26-year-old forward will be available on a free transfer in the summer, and Southampton are understood to be keen.

However, the Saints will face competition from Italian giants Inter Milan and German club Wolfsburg.

Southampton chief Koeman has made signing a new front-man his priority after seeing top-scorer Graziano Pelle go 11 Premier League games without scoring.