Things like that [clubs] are only going to help if that is the sort of thing he would be interested in in the first place, try getting him to socialise more on a every day level first, introduce him to other friends of yours first...I know this can be hard, but be selective and it may work [if that makes sense], try to introduce him to people with common interests, but be aware, this can be so hard, if he is quiet, people may be wary of talking to him....this is what I mean about being selective.... Only you know if you have others around you that can help you out. And at the end of the day, althought this may sound harsh, there is only so much you can do, if he is really low and depressed maybe it would be helpful if he saw a doctor.
Lisa x