The Ecuador international has found himself playing at full-back for large parts of this season, as manager Sir Alex Ferguson looked to compensate for injuries to Rafael, Phil Jones and Chris Smalling.
However, the 26-year-old has recently featured in a more advanced role, culminating in a man-of-the-match performance against Bolton Wanderers on Saturday.
"It is really pleasing thinking that we are getting everyone back to full fitness," he told MUTV. "It is nice to be back in my favoured position, that I have always played in throughout my career.
"At full-back, going forward is not a problem. Defending is slightly more difficult.
"There is more pressure because you are playing closer to your own goal. You have to be really focused and concentrated to make sure you don't commit an error that can lead to a goal."
Valencia joined United in 2009 from Wigan Athletic.