After ten months on the sidelines, Mark O'Brien is in the U21 squad for the Rams as they entertain Hull City today.
The unlucky 21 year-old could play his first competetive game since the injury. He was diagnosed with a 'mini pothole' in the cartilage. This in turn caused swelling and pain to the knee.
Mark underwent surgery for the injury in March of this year and has slowly fought his way back to fitness
Source: Derby County-Mad