Knill spoke to The Star before Saturday's game at Gigg Lane.
Knill's first full season in charge of the Millers were an uphill struggle with the club starting the season with a ten points deduction for entering administration.
After a run of fourteen games without a win Knill and the Millers parted company.
He explains: "I thought it was pretty unjust the way I was sacked but you get on with it and move on.
"I think I learned a lot from the experience and it has made me a better manager. I certainly enjoyed my time at Rotherham even though there was turbulence. It is a really good club and it seems to have gone back to what it was like when I first joined the club.
"There is stability there again and I think there are good times ahead for Rotherham. It is a big game for us to see how far we have come. Rotherham are one of the favourites to be promoted.
"They have one of the best strikers in the league in Adam Le Fondre and spent some money in the summer on Tom Pope. Rotherham have some good players but we are going okay after a difficult start."