The Scot left Aston Villa in August for Palace.
"I'd kind of stalled at Villa," Bannan told the South London Press. "I wasn't going anywhere. I needed to get out of my comfort zone.
"When I was younger I was always a player that would make things happen but then I was playing as a holding midfielder. "I'm not saying anything bad - I enjoyed working under Paul Lambert - but it was a role that didn't really suit me. I was sitting in front of the back four alongside Ashley Westwood.
"In saying that it probably got something different into my game, made me better tactically. But I couldn't really attack.
"Villa is a club that will always be in my heart. I spent eight years there.
"It petered out at the end a little bit and didn't work out the way I wanted it to. I grew up as a Celtic fan, but I'd say I support them as well."
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