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The youngster, who is spending time with the Royals in an attempt to reach full match fitness before returning to Highbury, put in a superb performance in the heart of the Reading defence on Saturday.
The Royals have recorded some decent results in recent weeks and are poised in eighth place and can smell the intoxicating waft of the play-off places.
Upson's loan spell comes to an end in a months time but he feels that Reading can push onto greater things after he's left.
"When I leave I can't see why they (Reading) can't push on, definitely," he said to readingfc.co.uk.
It is well known that as a club Reading have the ambition to one day play in the top flight, something Upson believes is possible. The former Luton Town man admits the club has the potential to fulfill their lofty ambitions.
He commented: "I think as a club it is of Premiership quality. I think the whole situation - the catchment area, the facilities, the financial situation and the players on the pitch. The whole basis is there to go into the top division."
Upson has been a massive hit since arriving at the club two months ago but he admits arriving at a new club has been difficult.
"Coming from Arsenal there are always expectations. It was a big, big test for me. The longer you don't play, the more you believe the negative thoughts in your head that question whether your going to play again or if you're good enough.
"Now I look back, thinking like that was stupid, I know the quality I've got in myself and I knew it would only be a matter of time before I got that back again.
"When I first came here I knew I'd have a problem with match fitness and I needed the manager to have a bit of trust in me because that was the only wat I was going to get better."
Upson's loan spell expires on the 7th December when he will return to Arsenal.
Seven Premiership clubs are reputedly ready to take Upson off Arsenal's books should Arsene Wenger declare him surplus to requirements. However, with Pascal Cygan in poor form that appears an unlikely scenario.
The Royals would dearly like to keep the 23-year-old but there chances appear slim as they will not be able to afford him.