Sunderland defender Anton Ferdinand is backing older brother Rio to rediscover his best form at Manchester United.
United defender Rio has come in for criticism about his form lately and is struggling with a calf injury which shows no sign of improving.
"I know my brother and he'll come back stronger than ever," said Anton.
"People are doubting him for the World Cup - it's astonishing, he's been England's best player at the last two."