The young midfielder says he is ready to take the step up to first team action, and is happy to play out of position to achieve it
The Red Devils are short of cover at left back following Fabio's season-long loan deal to QPR, and the Irish winger has played as a full-back in some of United's pre-season games, a role he claims he has the correct attributes to succeed in.
He also revealed that manager Alex Ferguson has been including him in the back four during training sessions, and hopes to establish himself as a worthy deputy to Patrice Evra - providing no-one else is signed in the meantime.
"On the first day back in pre-season, the gaffer put me into left-back and I had a feeling that was the way he was thinking for me.
"I had to learn quickly but I'm very comfortable playing at left-back. I'm not a bad tackler, decent in the air, but maybe I have to work on my positional sense as a defender. The manager was happy, though.
"We'll have to wait and see what happens between now and the start of the season next week, but they've no real cover for Patrice Evra. I think I'm first in line if anything happens to him, unless they sign someone in the meantime."