The Irish winger is on-loan at Hull City until the New Year.
"It's not the right time at the minute," Joyce told the Hull Daily Mail. "For now we're just pleased with the way it's going for Robbie.
"I can't imagine anything will be talked about until after Christmas and we'll make a decision then.
"It's important for Robbie just to concentrate on his football for now and make sure that his next game is his best one."