The 26-year-old has been in fine form ever since he arrived at the Hawthorns from Reading, and it looks as though the Baggies face a battle to keep hold of their prized asset.
Daily Mirror has suggested that both Lazio and Sevilla are keeping close tabs on the Republic of Ireland international.
Long has just over a year left on his deal at the Hawthorns, although the club have the option to extend his contract for another year.
The highly rated forward could be tempted into leaving the Baggies in the summer, especially if Chelsea allow Romelu Lukaku to spend another season at West Brom.
Following a bright start to the current season, Long lost his place in the starting line-up, which is probably the main reason why he has scored just 6 league goals this term.