Ferguson spoke yesterday about Brady being a long-term player at United.
"Young Robbie Brady will be at left-back. He's actually an outside-left but we believe there's the possibility he'll develop into a left-back. He was on loan last year at Hull City and did very well. He'll certainly figure at left-back. I don't know how many substitutes will be allowed - we need to establish that - but I'm sure we can be flexible. It's important the young players get a chance to play on such a big occasion."