Celtic's McDonald eager for Man Utd clash
The Australian forward was a Motherwell player when the teams last clashed in 2006-07.
"They are going to be fantastic games. The rivalry is there between Scotland and England. We played against them a couple of years ago and got a victory. It promises to be a great atmosphere in both games," he told Sky Sports News.
"Our home form is very good, it's just our away form that has been very poor. If we can get that right it will go a long way to getting through to the next round."