The 19-year-old midfielder has signed for the O's on an initial one-month deal from Harry Redknapp's Sky Bet Championship outfit.
And the Republic of Ireland Under-21 international is hopeful that his spell at Brisbane Road will be a fruitful one.
"I'm delighted, it's a massive opportunity for me, especially when the club has been in such good form and I want that to continue," Sutherland told Orient's official website.
"As soon as I walked through the door I was made to feel welcome. Everyone is really positive and it makes me feel raring to go.
"I want to play as much as I can and learn and be the best I possibly can. If I can come here and do well then I'd love to stay here until the end of the season.
"QPR have had a similar start and I see Orient as a similar club in a way; it's a compact stadium which is what I'm used to having grown up watching QPR and I can't wait to get started."