The young US international has completed a two-week trial with the Old Trafford outfit.
Adu’s stint with United has captured the attention of soccer observers across the Atlantic.
Although Chelsea had also previously expressed an interest in the 17-year-old, who failed to make the Major Soccer League play-offs with DC United this season, his club coach Peter Nowak believes, if the player is set on furthering his career in Europe, he would be better advised moving to Holland.
However, while Adu – the youngest player to be capped by the USA – impressed Ferguson during his time in England, under British employment legislation, the Red Devils’ boss cannot even consider whether to offer him a contract until he reaches his 18th birthday on June 2.
“Freddy has done all right,” confirmed Ferguson.
“He is a good talented young boy but there is nothing we can do about him.
“What we did was to bring him here to give him an idea of what United was like so he could see the place.
“He is a very confident and talented boy but nothing can be done yet.
“He will go back to the US and we will keep a check on him. Then, when he is 18, we will have to assess what we can do next.”