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In page Matthew Rees:

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With the regionalisation of Welsh professional club rugby, Rees joined Celtic Warriors in 2003. Rees made 16 appearances for the Warriors in the 2003–04 Celtic League, as well as one appearance in the 2003–04 Heineken Cup. The Celtic Warriors team was disbanded after its first season due to financial issues however, and Rees moved to Llanelli Scarlets, another one of the recently founded Welsh regional sides.[1]