Grant said: "He's better than he was one month ago. I think in one month or two months, if everything goes as we want, he will be ready for us.
"It is important because Michael Ballack is a great player, he's a matchwinner and I expect him to be back soon.
"I hope everything will go well because in the past he had some problems. I can say for the moment, I'm very happy and I hope as soon as possible he will be back. He can be an important player."