The reserves were in action at Norwich City in a friendly last night.
It ended goalless as Clive Allen's side looked to gain some match practice before the league campaign resumes next week.
Allen said: "Dorian said he felt something in his knee when he was tackled, so that was very disappointing.
"The other injury was a completely accidental clash of heads with Tomas Pekhart - he was concussed, went to hospital as a precaution but was able to travel home.
"It was a great shame because it was a game played in the right spirit. It was a high level, high intensity game on a quality playing surface at Carrow Road."