It is the striker's first chance of football at that level.
Former Scotland international Donachie told the Evening Chronicle: "It's great for Adam, and great for England - it's just a shame he's not Scottish!
"It's a great opportunity for Adam.
"He's got pace and he's got a football brain. What he needs to do now is work really, really hard at his game.
"It's all about developing and working hard.
"He needs to progress and get better. He has a great chance."