The Rangers caretaker boss will go head to head with Sir Alex Ferguson. One of the greatest managers of all time.
"I'll admit I will be in awe of Sir Alex, he's a great manager," said Ainsworth.
"If you'd asked me a few weeks ago then not in my wildest dreams did I think I'd be pitting myself against him."
He added: "We're the underdogs and we're not expected to win but if we put the passion in we can achieve anything at this club.
"The Premier League is the place we want to be so this is going to be a little taste of what the boys can expect and what they can look forward to, because I believe QPR will be in the Premier League very soon.
"I'll still feel the pressure, though. We want to go up there and give a good account of ourselves and who knows what will happen?
"It's going to be a massive challenge for us and an amazing experience for the boys. Some people say they won't play their first team but their second team is pretty good as well.
"But we'll just take it as it comes. I'll be a very proud man to be in the opposite dug-out to Sir Alex, it will be a big moment in my career."