I think what would have affected luque the most from that injury was the affect it had on his pace as he used to be quick when he played in spain and for a winger/striker to have pace and then lose it can have a dramatic affect on their overall performance.
and just look at that goal he scored against real madrid when he raped salgado. He couldn't out pace lee clark based on recent performances. But hopefully if what sam says is true and they can get him to the same fitness levels he had before he joined then he could have an upturn in fortune with us.