Smalling is reportedly surplus to requirements at Manchester United this summer.The Red Devils announced on Saturday that they had agreed a deal with Benfica to sign centre-half Victor Lindelof, who should complete his move to United by the end of the week.Gunners manager Arsene Wenger switched to a 3-4-3 formation towards the end of last season and could look to bring in another centre-half after relying on left-back Nacho Monreal on a number of occasions.