Birmingham have signed Argentinian striker Mauro Zarate on loan until the end of the season in their bid to preserve Barclays Premier League status.Zarate, whose move from Qatar´s Al Sadd could be made permanent in the summer, follows the arrivals of David Murphy and James McFadden at St Andrews.The 20-year-old hit his country´s winner in the final of the Under-20 World Cup last year.
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