Loghain knows exactly who Anders is, by reputation if not by sight. It's not too difficult to distinguish him from the other in the party; given the looks of unease or outright hostility he receives from others, it's no surprise he tends to keep to himself. It's an instinct Loghain recognizes well.

He gives his head a shake. "No, no. Not injured. Road weary, and needing some time off my feet--but thank you for inquiring, all the same." One hand gestures to the vacant spot in the grass and dirt next to him. "You're welcome to join me, if you've finished your rounds."