Recent criticism has come in for the 32-year old England defender with some suggesting that perhaps his time with both club and country is up.
But Welbeck has given his full backing to Ferdinand, saying he still has plenty to offer.
"We all know what capabilities he's got - he's a Rolls-Royce of a defender," Welbeck said.
"It's wrong to write him off. We all know the ability he's got."