The young striker spent time away with Royal Antwerp last term and Joyce feels the experience garnered in Belgium will stand him in good stead ahead of playing in front of large crowds at Bramall Lane.
Danny Wilson's Blades came agonisingly close to promotion in 2011/2012 and it is likely that Cofie will be asked to provide a cutting edge in attack.
"It's a good move for him," Joyce explained to ManUtd.com. "Obviously, it helped him going to Antwerp for six months as it aided his development.
"Going to Sheffield United is another test for him. They are a big club with a big fan-base but he had a taste of it with Antwerp. Their fan-base is unbelievable and they have passionate supporters who could match the Sheffield fans really."
Another centre-forward who will be unavailable to Joyce, probably for the rest of 2012, is least season's top scorer Will Keane, who sustained a cruciate knee ligament injury whilst on England Under-19 duty.
"It's unfortunate after such a good campaign," added Joyce. "It was his last game before going on holiday really and he picks up an injury and it's one that will keep him out for a while.
"It's very disappointing for the boy and for the club."