Joseph is a good player who could well end up worth the million he cost you, at 22 years old already has 90 something games and 19 goals to his name, he impressed here on loan and is a player I would of liked here, good athlete with a great attitude.
Not the greatest finisher but has plenty else to his game, my only worry for you would be that's the second injury which has kept him out for a few months in less than a year, he puts himself about so you have to expect the odd knock though and it might just be a bad run of luck.
However, he cost you a million or more, no point denying it, not certain why you are to be honest.