The Russia international had been linked with a move away from the Madejski Stadium during the summer following Reading's relegation from the Premier League.
However, no deal materialised and the striker is now focused on the task of trying to help Reading win promotion back to the top flight.
"I don't make a secret of it that I was waiting for a change to come," the 29-year-old is quoted as saying by Sovsport.ru.
"I couldn't accept that I'd play in a lower division. It had an effect on my mood, but now I'm fully devoted to Reading.
"I do want to believe that we can go back to the Premier League after this season.
"After the transfer period, I told our manager that I'm ready to fight for the team and I started to work at the maximum - it's the most important thing. Football is 90 per cent what you do in training and only 10 per cent playing."
Reading currently sit seventh in the Championship table after picking up 19 points from their opening 11 games and Pogrebnyak has been impressed by the standard in the division.
He added: "The Championship is about fight, power and physicality.
"Of course, they play smarter football in the Premier League. There, you can see a more unexpected pass or play. But the Championship is also a serious league.
"Honestly, I also under-rated it until I played some games. It's so difficult to play here that I can't express it with words.
"All teams can defend well and play very clever tactics. That's why the final result is regularly 1-0 or 0-0. Here, it's very important to score the first goal, so in that case you can play on the counter-attack. It's difficult when you're losing."
He continued: "It's not a shame to play in the Championship after the Premier League. Before the season, some people said that Adebayor or Defoe were close to joining this league."