Quinn allowed to miss Palace date
Manager Gary Speed refused to discuss the specific details but they are believed to be 'family related' and Quinn has been granted time off.
The 24-year-old, who joined the Blades as a schoolboy, was a surprise omission from the squad for last weekend's victory at Millwall.
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Hide AdHe had started the previous seven games and had scored his first goal of the season in the club's last home game against Ipswich Town.
Former Blades and Huddersfield Town winger Ronnie Simpson has passed away, aged 76, after a short illness.