Belgian midfielder Marouane Fellaini will wear the number 31 shirt for Manchester United this season.
The 25-year-old, who completed a £27.5m move from Everton on Monday evening, could make his debut for the Premier League champions against Crystal Palace at home on September 14.
"We can confirm new signing Marouane Fellaini - @fellainiM - will wear the no.31 shirt for #mufc," the club posted on their official Twitter page.
Fellaini joined Everton from Standard Liege in 2008.