Sir Alex Ferguson has no idea who will be on Manchester United's summer tour of South Africa and China.

The United boss has confirmed new arrivals Shinji Kagawa and Nick Powell will be making their first Red Devils' appearances on the trip but the remainder of his squad is open to considerable doubt for the simple reason Ferguson does not know who he will be able to pick.

"It's obviously very difficult in a year when we have had a Euro tournament and we also have the Olympics," said Ferguson. "The final squad hasn't been decided yet but we will be taking the strongest team we have available."

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