Berba says the best thing Chicharito can do is heed the word of the manager.
He told manutd.com: "I'm not used to giving advice! He just needs to listen to people closest to him and the boss and keep doing what he's been doing. I saw his goals at the World Cup, and during pre-season I've seen how well he trains and his performances in games and he's also a great guy.
"If he continues like this I think he has a very bright future."