"When the Turkish people say you're still not quite ready to come back, it's a bit of a kick in the ribs," he told Reading's official website.
"It's been a while coming back from injury, about five months, but I want to show them what I can do."
Karacan has started six of the eight Royals games this season.
"When you put the shirt, you know you've worked hard for it," said the 23-year-old. "We're always told that it's all about the team, which it is.
"If things aren't going your way then you've got to give 100 per cent. The Premier League is hard, not just physically, but mentally.
"You've got players popping up in places you don't expect, so you always have to be on your toes."