The former Wales international arrived at the BT Sport Cardiff Arms Park from Scarlets in the summer of 2013 but was diagnosed with testicular cancer that October.
Rees has since successfully been treated and returned to the game in fine style and Wilson insists his words of wisdom, coupled with his talents on the pitch, will prove priceless ahead of the forthcoming campaign.
"Matthew brings real leadership and vast experience to our squad. He will also be working closely with our young hookers to bring them on and develop them as players," said Wilson.
The Blues also confirmed the return of lock James Down, 27, who left to join London Welsh in July 2014.
"James had a fantastic personal season at London Welsh and his stats in the Aviva Premiership were outstanding," added Wilson.
"He is a strong lineout forward and there is no doubt he returns to Cardiff Blues a better player.
"There was a lot of interest in James from clubs in both the Aviva Premiership and Top 14 in France.
"However, he is a local boy and passionate about playing his rugby for our region so we are delighted he is coming back home."
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