Arsenal striker Robin van Persie believes set pieces remain a crucial area of weakness for his former club. Earlier this season, Van Persie highlighted the problem area under Unai Emery and admitted the issues existed back in his days at the Emirates.The Gunners almost fell behind in their FA Cup quarter-final against Sheffield United when John Lundstram headed home from a deal ball only for the goal to be ruled out for offside.A Nicolas Pepe penalty ensured the Gunners took the lead soon after - but they again needed the flag to spare their blushes when John Egan again bundled in from a set-piece.A long throw caused chaos late on and gave David McGoldrick an equaliser only for Dani Ceballos to snatch a stoppage time winner for the Gunners..
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