4. David Villa (Barcelona)
The Barcelona forward is likely to leave the Nou Camp at the end of the season after falling out of favour with boss Tito Vilanova. The 32-year-old has still shown he has an eye for goal though, and would give Liverpool more options upfront than just Luis Suarez and Daniel Sturridge. Although not a long-term option, he could have a good year or two left in him to help the Reds into the top four.