The One Signing Man Utd Must Seal Before Deadline Ends

Manchester United have started the season in fantastic fashion. The Red Devils have won their first three PL games, scored 10 goals and conceded none.
Under the management of Mourinho, the Old Trafford club are firm favorites to win the title this season but the Portuguese boss must seal one more key signing before the deadline ends on Thursday.
The former Chelsea manager has sorted out his strike-force by signing Lukaku and agreeing a new deal with Zlatan Ibrahimovic.
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Jose is renowned for his defensive strength and for that he has lured to stars in the form of center half Lindelof and defensive midfielder Matic.
United have been in search of a wide player this summer, however, they have so far failed to lure one. Mourinho must act swiftly to sign a top winger before the transfer window closes.
The likes of Martial, Lingard and Rashford have quality but they are not world class players. As per reports in Spain (Via Don Balon), United have made a move to lure Gareth Bale and he would be the perfect signing for Jose.
In your opinion, who should United sign to strengthen their wide positions?