Arsenal must keep Walcott - Campbell

Former Arsenal defender Sol Campbell and buy "top players" in the January transfer window.

The 23-year-old has yet to agree a new deal with his current contract set to expire in the summer, and Campbell tells BBC Sport's David Ornstein the club are "crazy" to lose good players before they reach 30.

The Former England captain, who had two stints at Arsenal in 2001-2006 and for five months in 2010, says it is "critical" the club improve their squad in January.

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