Manchester United have announced Sofyan Amrabat's shirt number.
The midfielder has arrived at United on-loan from Fiorentina with an option to buy.
And Amrabat will this season wear the No4.
The No4 shirt was most recently worn by Phil Jones, who left the club this summer when his contract expired.
The former England defender had been its occupant for 12 years following his transfer from Blackburn Rovers in the summer of 2011.