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Hammers boss Sam Allardyce is looking to reinforce his defensive options having lost Joey O'Brien to injury in the goalless draw with Chelsea at Stamford Bridge on Wednesday night.
With O'Brien set to be on the sidelines for between 10 to 12 weeks with a dislocated shoulder, Allardyce has moved quickly to identify Armero as his main target to replace the injury stricken Republic of Ireland international.
Armero, 27, was on the verge of joining AC Milan on a six-month loan deal earlier this month in a move that would have seen Kevin Constant go in the opposite direction.
However the deal fell through when Constant rejected a move to the Stadio San Paolo in favour of staying at the San Siro.
According to reports in Italy, West Ham are now in pole position to land Armero, who only joined Napoli permanently in the summer having spent the final six months of last season on loan at the club.
Hammers' left-back George McCartney, who has struggled with injuries th
