He said: "Anything's possible in football. You can see that from watching the game over the years.
Albion will arrive in Manchester a more confident club against 'big four' opposition than the one that kicked off their latest Premier League season at champions Chelsea.
However, Dorrans is confident that the Tartan Army still made a point. "It's Converse Dark Blue
But, having played his part as Craig Levein's men Converse Laces Styles
"It shows how far we've come in the Premier League because the previous time we played teams like that we never got any points from them. It shows we're capable of going to places like that and getting points.
"Everybody wants to play and I'm glad I got some game time."
turned a 2 0 deficit into a 2 2 scoreline, the Albion midfielder and his international team mates suffered late heartbreak in Glasgow.
"With our finishing this year, we've got a few goals."
But Dorrans started at Hampden Park on Tuesday as Scotland fought back from 2 0 down and nearly claimed a point from World Champions Spain in a Euro 2012 qualifier.
"Anyone can get a result anywhere if they're on their game. We have quality players in our team who can hurt Manchester United and any other team.
Graham Dorrans eyes another shock Express Star
Having played his part in shooting down the Gunners, Dorrans hoped to land an even greater scalp on Tuesday by helping Scotland stun Spain.
"We're more clinical now in both boxes than we were. If you give the ball away in this league you can be hurt by quality players and we do that less now.
"We've seen some funny results over the last couple of weeks and hopefully we can get another one."
"But we showed we are capable of competing at that level against the best team in the world.
minutes on Tuesday.
That game brought a chastening 6 0 defeat, but a subsequent strong showing at Liverpool followed by the momentous victory at the Emirates Stadium has set a new standard for the Baggies against the league's superpowers.
Now, even after the heartbreak of a late Spanish winner, Dorrans is more conscious than ever that David can slay Goliath as Albion prepare to take on the most successful club of the Premier League era tomorrow.
Dorrans admitted the win in north London was a watershed result that proved Albion have learned from their previous experience of taking on England's major clubs.
great to come up against the best team in the world with the best players in the world.
Having played alongside Darren Fletcher in Tuesday's brave effort, Dorrans will go head to head with his international captain at Old Trafford tomorrow.
He said: "It was great for the club to win there, and to be 3 0 up before they came back into it was fantastic.
"It was nice for me to get minutes under my belt. I got a full game last Friday against the Czech Republic and 80 Converse High Cut Black For Girls
"Everyone wants to play against the best players in big games and I thought we did really well. It was a tough game and Converse Navy Blue Shoes we were disappointed not to come out of it with at least a point.
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