Mark O'Brien is a young defender who captained Derby County's U18 team during 2010-11 as well as appearing regularly in the Rams' reserves. Mark made his Football League debut as a 16-year-old in May 2009. He was the club's Scholar of the Year in 2008-09 but medical problems saw him miss a large part of the following season. Mark was back in action early in 2010 and was included on the first-team bench in the early weeks of 2010-11. Mark added to his first-team experience with a couple of brief appearances from the bench as he continued his development during the season. Mark has represented the Republic of Ireland at U16 and U17 levels.
Jose Mourinho has admitted he is in the worst spell of his managerial career.