Reports have been that he has looked ordinary at best. Very short of a run, which is to be expected because firstly he has barely played in the last couple of years and secondly he is playing in a new position where he would not be used to defensive structures, running lines, etc.
Apparently he has been doing some good things which is positive, but not up to first grade standard yet.
I don't think it is too much to worry about, he will definitely get better with more game time.