The 17-year-old Welsh midfielder was one of the hottest properties in the British transfer market this summer, and opted to join the Gunners from Cardiff ahead of Manchester United and Everton.
"Arsenal is a club which always gives young players an opportunity at the highest level of the game and I am going to work my hardest to be part of future successes here," said Ramsey, whose £5million move was formally completed on Friday.
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