Ramsey started the 3rd round FA Cup tie when Arsenal beat Plymouth at The Emirates earlier this month. He's likely to be on the bench on Sunday as he faces his former team.
"Cardiff City was a big part of my life, I was there for a long time having come through the youth system there," Ramsey told the South Wales Echo. "So it will be mixed emotions for me on Sunday.
"But I am an Arsenal player now and I want to win the game.
"I was at home in the living room watching the draw with my parents - my dad actually called it.
"When it came out, I had loads of texts about the game and now I'm really looking forward to it."
Now aged just 18 Ramsey already has an FA Cup runners up medal. He came off the bench for Cardiff in last season's final (a match he should have started). Most players see out a career without making it to Wembley but Ramsey did it in his first senior year. If he progresses with Arsenal he's sure to see a few more cup finals during his career.
"It was a great experience for everyone involved with Cardiff," he added.
"We did very well together and we were unfortunate not to get the win at Wembley.
"It's hard to describe how I felt, but I was looking forward to it more than anything.
"When Dave Jones told me to warm up, I started getting excited.
"Unfortunately we didn't win, but we were proud with our efforts for getting that far."