Eustace had the team in the top half of the table, while Rooney lost his job in a matter of months.
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Now Blackburn Rovers boss Eustace stated: "I didn't have a clue what the scores were, I wasn't interested in anyone else. I only cared that we were doing the right things and we did. I was very confident we'd come here and be competitive and we have."
On the Blues, he added: "My job was to come in and keep Blackburn up. I didn't want Birmingham to go down, they are a club close to my heart and I have a lot of friends there. But my focus was here.
"It'd been a fantastic start to the season to leave Birmingham in sixth position. Now to keep Blackburn up has been a group effort. We've never doubted ourselves."