Paul Pogba has signed for Manchester United for a record club fee of £89m.
He is worth every penny United have paid to re-sign him from Juventus, says former team-mate Rio Ferdinand.
Pogba joined United in 2009 but made only seven substitute appearances before leaving for Italy in 2012 as a 19-year-old, with a tribunal ruling Juve had to pay £1.5m for him.
