Mikel Arteta must solve Arsenal's defensive issues if the club want to compete for trophies regularly, according to Robin van Persie.
The Gunners made it through to the last four of the FA Cup on Sunday, defeating Sheffield United 2-1 at Bramall Lane thanks to a stoppage-time winner from substitute Dani Ceballos.
However, the late goal helped overshadow the shoddy defending that had allowed United to draw level in the closing minutes, Sead Kolasinac's weak clearance hitting Shkodran Mustafi to inadvertently set up David McGoldrick.
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Arsenal have conceded 41 goals in 31 Premier League games and, while supporting Arteta's appointment, Van Persie feels reinforcements are required to strengthen a long-standing area of weakness.