Giggs is expected to play at Cardiff for the first time in his career today.
Caulker said: "I have played against Ryan and managed to play with him at the Olympics.
"That was a great privilege. He's a fantastic player and a great icon within the game for young players.
"He has played at United for many years and got such a fantastic record. Ryan is definitely someone who is idolised around the world and proves his worth every week."
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