Sam Allardyce's faith in Jermain Defoe's ability as a lone striker has contributed to his goalscoring form. Jermain Defoe believes his deployment as a lone striker has been key to his recent goalscoring form as Sunderland prepare for Sunday's crunch Premier League clash with Arsenal.  Former Sunderland manager Dick Advocaat reportedly told ex-England international Defoe he could not play in the position, instead preferring to use him on the left.  Sam Allardyce, who replaced the Dutchman on Wearside in October,  has opted to play Defoe at the head of a 4-5-1 system in recent games, and the decision paid off as he netted his 16th goal of the season in last weekend's 3-0 victory...
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