Cahill has revealed he rejected Premier League interest to join Championship side Bournemouth.
He said: “I could've stayed in the Premier League - Palace offered me another year.
“They needed to lower the age of the squad, so that didn't work out, but it was fantastic there.
“It's a great football club and I enjoyed my two years, but I had other opportunities as well to stay in the league.
“This isn't me being disrespectful, but the teams that I would have gone to, I would maybe have been losing more games than winning.
“Speaking from my own point of view, am I going to add to my appearances or am I going to have a different challenge and come to a club that, again, is changing and, ultimately, challenge for promotion?
“I took quite a bit of time in the summer because of that reason - I was unsure what I wanted to do in terms of my future.
“I spoke when I first signed here about what was going to drive me, what was I doing it for. The longer I was off, the more I missed playing. I missed the games, first and foremost."
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