The lanky forward starred for Rangers between 2008-2012, and is now plying his trade in Italy with Palermo.
Lafferty netted an impressive 11 goals in 34 outings for the Serie B side last term – his first campaign since joining them from Sion – helping them to top the division and seal an immediate return to the top tier.
This has alerted Harry Redknapp, who is keen to bolster his squad after the Super Hoops’ recent play-off success.
Wembley hero Bobby Zamora and veteran forward Andrew Johnson are both set to be out of contract soon, and Lafferty is seen as a good replacement.
The 6ft. 4” 26-year-old has the physical presence to suit Premier League action, and could form a promising partnership with Charlie Austin – who is expected to lead the line for the Londoners after starring in the Championship.
A move for Lafferty may also indicate a willingness to avoid ageing players on big salaries, which has been a hallmark of the Loftus Road side’s recent dealings.