At least two Championship clubs are said to have plotted a move for Joe Garner.
The 26-year-old's current contract with Preston North End is due to expire next summer and as yet, no agreement has been reached over an extension to those terms.
That has alerted teams in England's second tier, including Wolverhampton Wanderers and Brentford, according to Sky Sports News.
Garner joined Preston in January 2013 following his release by Watford.