The Chelsea striker has made just five appearances and is yet to score for the Blues following his ?18million switch from Anderlecht in the summer.
Andre Villas-Boas has a wealth of attacking talent to select from and could see a short-term switch as a positive in the Belgium international's development.
The Spain game: Lukaku could be tempted by a temporary switch to La Liga
A situation which greatly benefited Daniel Sturridge who scored eight goals in 12 league appearances while on loan at Bolton last season.
Villarreal boss Juan Carlos Garrido has a number of major injury headaches to contend with, including striker Giuseppe Rossi who is out for six months. [related]
Source: Daily Mail
Source: Daily Mail