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."