The midfielder is showing good form with the struggling Sky Blues.
Joyce told the United Review: "He found it hard at Scunthorpe but the staff there were brilliant for him. Alan Knill and Chris Brass really helped him and it opened his eyes a little bit.
"He's been able to build on that at Coventry and he's got a lot of space in the Championship. Teams don't know about him and they're not closing him down quickly enough so he's benefited from that. His passing can hurt teams, no doubt about that."