Checked on transfermarket...thought he played midfield for hamburg?
At Anderlecht it was 1 appearance out of 121 in midfield. At Hamburg it was around 60% of his matches in midfield (not totally accurate as some games don't have a position listed for him).
I'd say he was a natural defender, who could do a job in a limited role in midfield. No idea what our original plan was, but our immediate need was a midfield tackler. That will have changed once we got De Jong, and then Barry also. Whether moving him back was because of that, or we bought them because we wanted to move him back anyway, I have no idea. It was a good move though!