Mitchell made his debut for the Ospreys in 2006, but had to wait until 2009 to make his first start for the club, the milestone coming against Leinster on 18 September.[2]
In 2011, Mitchell departed the Ospreys for the Exeter Chiefs, and spent three seasons with the newly promoted side.[3]
It was announced by Exeter Chiefs on 21 January 2014 that Mitchell will be leaving the Chiefs to join Welsh side Cardiff Blues on a three-year deal.[4]
Mitchell departed Cardiff one year ahead of the end of his contract, joining the Newport Gwent Dragons in a bid for more match time.[5]
Following his release from the Dragons, Mitchell was signed by Bath Rugby on a trial basis, but was injured in training and never made an appearance for the West Country club.[6]
In early 2018, Mitchell joined Yorkshire Carnegie, initially as a short term signing,[7] but later extended his contract to cover another season.[8]
At the beginning of the 2018–2019 season, Mitchell signed with Newcastle Falcons as short term injury cover, before rejoining Yorkshire.[9]
In international rugby he has earned caps for Wales at U16, U18, U19 and U21 levels; he has captained the U19 squad. During the 2009 Summer Tour to America and Canada, Michell earned two senior caps for his country, both as a replacement.[12]
Following his introduction into the Welsh set up in the summer of 2009, Mitchell was selected as the only specialist tight-head in Warren Gatland's autumn test squad, however despite his specialist knowledge in the position, fellow Osprey player Paul James was selected to start against New Zealand in the No.3 spot and has held the spot for several international tests since. Mitchell did feature during the autumn, earning his third international Welsh cap coming on as a replacement against Samoa.
Not initially selected in the touring squad for the 2010 summer trip to New Zealand and home test against South Africa, Mitchell was on the stand by list as injury cover. He was called upon prior to departure to New Zealand, and joined the full squad, coming off the bench in the second test against New Zealand.[13]
Mitchell was part of the Wales squad for the 2011 Rugby World Cup, and made his sole appearance of the tournament with a start against Namibia.
During the 2013 tour of Japan, Mitchell was ruled out of the first test due to injury, but came off the bench in the second.[15] This was to be his final appearance for Wales.
It was announced on 27 June 2013 that Mitchell had been arrested in Brisbane, Australia following the Lions first test against Australia on 22 June. Mitchell who had been in Australia as a fan admitted assault occasioning bodily harm with a circumstance of aggravation (being he was in company) after hitting Cian Barry at the Red Hill pub in Brisbane.[16][17] Mitchell was sentenced to six months' imprisonment wholly suspended for two years, fined A$1,800 and ordered to pay A$3,000 in compensation to the victim.[18] In court Mitchell described his actions as "My actions... were totally unacceptable and unforgivable."[19]
