Rees will now feature for the Blues as they bid to end a five-match losing streak in the RaboDirect PRO12 with the visit of third-placed Ulster to Arms Park.
And defence coach McIntosh admits the news of Rees, who has featured five times in RaboDirect PRO12 this season, and his return has brought a smile to everyone's faces.
"It's phenomenal news. What can you say about the guy. He's an inspiration to us all. I have played with him and he is a fine rugby player," McIntosh told WalesOnline.
"He is also a tremendous friend and person. The boys are inspired by him. We have missed him, both off the field and on the pitch.
"He has come back in and called a spade a spade. He has really intensified training because of his attitude and just given the boys a huge, huge lift.
"They look at him and think 'crikey, what this guy has gone through is unbelievable and we have got no right to complain or be half-hearted in anything we do'."
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Guinness PRO12 Blues News
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